build(deps): bump actions/cache from 5 to 6 (#6168)

Bumps [actions/cache](https://github.com/actions/cache) from 5 to 6.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v5...v6)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci-cache-warmup.yml

@@ -17,7 +17,7 @@ jobs:
         with:
           targets: x86_64-pc-windows-gnu,x86_64-pc-windows-msvc
           components: rust-src
-      - uses: actions/cache/restore@v5
+      - uses: actions/cache/restore@v6
         with:
           # https://github.com/PyO3/maturin/discussions/1953
           path: ~/.cache/cargo-xwin
@@ -28,7 +28,7 @@ jobs:
           sudo apt-get install -y mingw-w64 llvm
           pip install nox
           nox -s test-cross-compilation-windows
-      - uses: actions/cache/save@v5
+      - uses: actions/cache/save@v6
         with:
           path: ~/.cache/cargo-xwin
           key: cargo-xwin-cache

.github/workflows/ci.yml

@@ -494,7 +494,7 @@ jobs:
       - uses: actions/setup-node@v6
         with:
           node-version: 24
-      - uses: actions/cache/restore@v5
+      - uses: actions/cache/restore@v6
         id: cache
         with:
           path: |
@@ -508,7 +508,7 @@ jobs:
         run: uvx nox -s build-emscripten
       - name: Test
         run: uvx nox -s test-emscripten
-      - uses: actions/cache/save@v5
+      - uses: actions/cache/save@v6
         if: ${{ github.ref == 'refs/heads/main' || contains(github.event.pull_request.labels.*.name, 'CI-save-pr-cache') }}
         with:
           path: |
@@ -539,7 +539,7 @@ jobs:
           # wasi sdk sets CC variables which break Python's configure script
           # (it also sets WASI_SDK_PATH even without `add-to-path`, which is sufficient)
           add-to-path: false
-      - uses: actions/cache/restore@v5
+      - uses: actions/cache/restore@v6
         id: cache
         with:
           path: |
@@ -553,7 +553,7 @@ jobs:
         run: uvx nox -s build-wasm
       - name: Test
         run: uvx nox -s test-wasm
-      - uses: actions/cache/save@v5
+      - uses: actions/cache/save@v6
         if: ${{ github.ref == 'refs/heads/main' || contains(github.event.pull_request.labels.*.name, 'CI-save-pr-cache') }}
         with:
           path: |
@@ -742,7 +742,7 @@ jobs:
           targets: x86_64-pc-windows-gnu,x86_64-pc-windows-msvc
           components: rust-src
       # load cache (prepared in ci-cache-warmup.yml)
-      - uses: actions/cache/restore@v5
+      - uses: actions/cache/restore@v6
         with:
           path: ~/.cache/cargo-xwin
           key: cargo-xwin-cache

.github/workflows/netlify-build.yml

@@ -39,7 +39,7 @@ jobs:
 
       - name: Restore lychee cache
         id: restore-cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: .lycheecache
           key: lychee-${{ github.run_id }}
@@ -56,7 +56,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Save lychee cache
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         if: ${{ github.ref == 'refs/heads/main' || contains(github.event.pull_request.labels.*.name, 'CI-save-pr-cache') }}
         with:
           path: .lycheecache