build(deps): bump memmap2 from 0.9.7 to 0.9.8

Bumps [memmap2](https://github.com/RazrFalcon/memmap2-rs) from 0.9.7 to 0.9.8.
- [Changelog](https://github.com/RazrFalcon/memmap2-rs/blob/master/CHANGELOG.md)
- [Commits](RazrFalcon/memmap2-rs@v0.9.7...v0.9.8)

---
updated-dependencies:
- dependency-name: memmap2
  dependency-version: 0.9.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]