chore(deps): update official github actions (major) (#148)

chore(deps): update official github actions

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci-flatpak.yml

@@ -124,7 +124,7 @@ jobs:
         run: cat "${APP_ID}.yml"
 
       - name: Cache Flatpak build
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8  # v6.0.0
         with:
           path: ./build/.flatpak-builder
           key: flatpak-${{ matrix.arch }}-${{ github.sha }}