CI: Bump actions/cache from 5.0.5 to 6.1.0 in the everything group

Bumps the everything group with 1 update: [actions/cache](https://github.com/actions/cache).


Updates `actions/cache` from 5.0.5 to 6.1.0
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](27d5ce7f10...55cc834586)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: 6.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: everything
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build-test.yml

@@ -158,7 +158,7 @@ jobs:
         with:
           path: repo
       - name: Cache $CCACHE_DIR
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9  # v5
         with:
           path: ${{ env.CCACHE_DIR }}
           key: msbuild-msvc-cmake

.github/workflows/reusable-build.yml

@@ -68,7 +68,7 @@ jobs:
           fetch-depth: ${{ inputs.dev-gcov && '0' || '1' }}  # Coverage flow needs full history
 
       - name: Cache $CCACHE_DIR
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9  # v5
         env:
           CACHE_KEY: ${{ env.CACHE_BASE_KEY }}-ccache
         with:

.github/workflows/reusable-rtlmeter-build.yml

@@ -50,7 +50,7 @@ jobs:
           sudo apt install ccache mold help2man libfl-dev libjemalloc-dev libsystemc-dev
 
       - name: Use saved ccache
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9  # v5
         with:
           path: ccache
           key: rtlmeter-build-ccache-${{ inputs.runs-on }}-${{ inputs.cc }}-${{ inputs.sha }}-${{ github.run_id }}-${{ github.run_attempt }}

.github/workflows/reusable-rtlmeter-run.yml

@@ -84,7 +84,7 @@ jobs:
 
       - name: Use saved ccache
         if: ${{ env.CCACHE_DISABLE == 0 }}
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9  # v5
         with:
           path: ${{ env.CCACHE_DIR }}
           key: rtlmeter-run-ccache-${{ inputs.runs-on }}-${{ inputs.cc }}-${{ inputs.cases }}-${{ inputs.compileArgs }}-${{ github.run_id }}-${{ github.run_attempt }}

.github/workflows/reusable-test.yml

@@ -67,7 +67,7 @@ jobs:
           ls -lsha
 
       - name: Cache $CCACHE_DIR
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9  # v5
         env:
           CACHE_KEY: ${{ env.CACHE_BASE_KEY }}-ccache2
         with: