Bump the development-dependencies group across 1 directory with 9 updates

Bumps the development-dependencies group with 9 updates in the /backend directory:

| Package | From | To |
| --- | --- | --- |
| [@eslint/js](https://github.com/eslint/eslint/tree/HEAD/packages/js) | `9.17.0` | `9.21.0` |
| [@types/express](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/express) | `4.17.21` | `5.0.0` |
| [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) | `22.10.5` | `22.13.9` |
| [eslint](https://github.com/eslint/eslint) | `9.16.0` | `9.21.0` |
| [globals](https://github.com/sindresorhus/globals) | `15.14.0` | `16.0.0` |
| [tsx](https://github.com/privatenumber/tsx) | `4.19.2` | `4.19.3` |
| [typescript](https://github.com/microsoft/TypeScript) | `5.7.3` | `5.8.2` |
| [typescript-eslint](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/typescript-eslint) | `8.19.1` | `8.26.0` |
| [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) | `3.0.5` | `3.0.7` |



Updates `@eslint/js` from 9.17.0 to 9.21.0
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/commits/v9.21.0/packages/js)

Updates `@types/express` from 4.17.21 to 5.0.0
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/express)

Updates `@types/node` from 22.10.5 to 22.13.9
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

Updates `eslint` from 9.16.0 to 9.21.0
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v9.16.0...v9.21.0)

Updates `globals` from 15.14.0 to 16.0.0
- [Release notes](https://github.com/sindresorhus/globals/releases)
- [Commits](sindresorhus/globals@v15.14.0...v16.0.0)

Updates `tsx` from 4.19.2 to 4.19.3
- [Release notes](https://github.com/privatenumber/tsx/releases)
- [Changelog](https://github.com/privatenumber/tsx/blob/master/release.config.cjs)
- [Commits](privatenumber/tsx@v4.19.2...v4.19.3)

Updates `typescript` from 5.7.3 to 5.8.2
- [Release notes](https://github.com/microsoft/TypeScript/releases)
- [Changelog](https://github.com/microsoft/TypeScript/blob/main/azure-pipelines.release.yml)
- [Commits](microsoft/TypeScript@v5.7.3...v5.8.2)

Updates `typescript-eslint` from 8.19.1 to 8.26.0
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/typescript-eslint/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v8.26.0/packages/typescript-eslint)

Updates `vitest` from 3.0.5 to 3.0.7
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v3.0.7/packages/vitest)

---
updated-dependencies:
- dependency-name: "@eslint/js"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development-dependencies
- dependency-name: "@types/express"
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: development-dependencies
- dependency-name: "@types/node"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development-dependencies
- dependency-name: eslint
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development-dependencies
- dependency-name: globals
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: development-dependencies
- dependency-name: tsx
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
- dependency-name: typescript
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development-dependencies
- dependency-name: typescript-eslint
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development-dependencies
- dependency-name: vitest
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]