ci(deps): bump actions/cache from 5 to 6 (#537)

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

.github/workflows/04-android-build.yml

@@ -73,7 +73,7 @@ jobs:
 
       # ── Step 1: build host protoc (using HOST compiler, NOT NDK) ───────
       - name: Cache host protoc
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: build_host
           key: ${{ runner.os }}-host-protoc-${{ hashFiles('thirdparty/protobuf/**', 'CMakeLists.txt') }}

.github/workflows/06-ios-build.yml

@@ -38,7 +38,7 @@ jobs:
           max-size: 150M
 
       - name: Cache host protoc build
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: build_host
           key: macos-host-protoc-${{ hashFiles('thirdparty/protobuf/**', 'CMakeLists.txt') }}

.github/workflows/07-linux-riscv-build.yml

@@ -165,7 +165,7 @@ jobs:
         shell: bash
 
       - name: Cache pip
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.cache/pip
           key: linux-riscv64-${{ runner.os }}-pip-${{ hashFiles('pyproject.toml') }}

.github/workflows/clang_tidy.yml

@@ -129,7 +129,7 @@ jobs:
       - name: Restore generated headers cache
         id: cache_headers
         if: steps.changed_files.outputs.any_changed == 'true'
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: |
             build/external
@@ -144,7 +144,7 @@ jobs:
 
       - name: Save generated headers cache
         if: steps.tidy_files.outputs.any_tidy_files == 'true' && steps.cache_headers.outputs.cache-hit != 'true'
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         with:
           path: |
             build/external