Bump actions/cache from 5 to 6 (#8489)

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.yml

@@ -111,7 +111,7 @@ jobs:
 
       - name: Restore rewatch build cache
         id: rewatch-build-cache
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: rewatch/target
           key: rewatch-build-v3-${{ matrix.rust-target }}-${{ hashFiles('rewatch/src/**', 'rewatch/Cargo.lock') }}
@@ -165,7 +165,7 @@ jobs:
 
       - name: Restore OPAM environment
         id: cache-opam-env
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: |
             ${{ runner.tool_cache }}/opam
@@ -201,7 +201,7 @@ jobs:
 
       - name: Cache OPAM environment
         if: steps.cache-opam-env.outputs.cache-hit != 'true'
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         with:
           path: |
             ${{ runner.tool_cache }}/opam
@@ -259,7 +259,7 @@ jobs:
       - name: Restore compiler build state
         if: github.base_ref == 'master' || github.ref == 'refs/heads/master'
         id: compiler-build-state
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: |
             C:\.cache\dune
@@ -284,7 +284,7 @@ jobs:
 
       - name: Save compiler build state
         if: github.event_name == 'push' && github.ref == 'refs/heads/master'
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         with:
           path: |
             C:\.cache\dune
@@ -348,7 +348,7 @@ jobs:
       #
       # - name: Restore previous benchmark data
       #   if: matrix.benchmarks
-      #   uses: actions/cache/restore@v5
+      #   uses: actions/cache/restore@v6
       #   with:
       #     path: ./tests/benchmark-cache
       #     key: syntax-benchmark-v1
@@ -369,7 +369,7 @@ jobs:
 
       # - name: Save benchmark data as new baseline
       #   if: matrix.benchmarks && github.ref == 'refs/heads/master'
-      #   uses: actions/cache/save@v5
+      #   uses: actions/cache/save@v6
       #   with:
       #     path: ./tests/benchmark-cache
       #     key: syntax-benchmark-v1

.github/workflows/coverage.yml

@@ -51,7 +51,7 @@ jobs:
       # and the cargo build when the rewatch sources haven't changed.
       - name: Restore rewatch build cache
         id: rewatch-build-cache
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: rewatch/target
           key: rewatch-build-v3-${{ env.RUST_TARGET }}-${{ hashFiles('rewatch/src/**', 'rewatch/Cargo.lock') }}
@@ -89,7 +89,7 @@ jobs:
 
       - name: Restore OPAM environment
         id: cache-opam-env
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: |
             ${{ runner.tool_cache }}/opam
@@ -127,7 +127,7 @@ jobs:
       # still get full restore from the latest master-saved cache.
       - name: Save OPAM environment
         if: steps.cache-opam-env.outputs.cache-hit != 'true' && github.event_name == 'push' && github.ref == 'refs/heads/master'
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         with:
           path: |
             ${{ runner.tool_cache }}/opam
@@ -168,7 +168,7 @@ jobs:
       - name: Restore coverage build state
         if: github.base_ref == 'master' || github.ref == 'refs/heads/master'
         id: coverage-build-state
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: |
             ~/.cache/dune
@@ -191,7 +191,7 @@ jobs:
 
       - name: Save coverage build state
         if: github.event_name == 'push' && github.ref == 'refs/heads/master'
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         with:
           path: |
             ~/.cache/dune