fix(ci): bump Action versions and fix toad-string working directory

- Bump actions/checkout v2→v4, actions/cache v2→v4, actions/setup-java v3→v4
- Fix ci_check.yml bug: working-directory was set to 'toad-map' instead of 'toad-string', silently skipping toad-string tests
- Migrate release-please v3→v4: replace command/sequential-calls with config-file/manifest-file params

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: smartyalgo

.github/workflows/ci_check.yml

@@ -10,12 +10,12 @@ jobs:
   ci_check:
     runs-on: 'ubuntu-latest'
     steps:
-    - uses: 'actions/checkout@v2'
-    - uses: 'actions/setup-java@v3'
+    - uses: 'actions/checkout@v4'
+    - uses: 'actions/setup-java@v4'
       with:
         distribution: 'liberica'
         java-version: '20'
-    - uses: 'actions/cache@v2'
+    - uses: 'actions/cache@v4'
       with:
         path: |
           ~/.rustup/toolchains
@@ -114,4 +114,4 @@ jobs:
     - name: 'check toad-string'
       run: 'cargo make ci'
       if: github.ref == 'refs/heads/main' || steps.package_changed.outputs.toad-string == 'true'
-      working-directory: 'toad-map'
+      working-directory: 'toad-string'

.github/workflows/release-please.yml

@@ -10,17 +10,17 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
-      - uses: google-github-actions/release-please-action@v3
+      - uses: google-github-actions/release-please-action@v4
         id: release
         with:
           token: ${{secrets.RELEASE_PLEASE_GITHUB_TOKEN}}
-          sequential-calls: true
-          command: manifest
+          config-file: release-please-config.json
+          manifest-file: .release-please-manifest.json
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         if: ${{ steps.release.outputs.releases_created }}
 
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         if: ${{ steps.release.outputs.releases_created }}
         with:
           path: |