chore(deps): update actions/cache action to v6 (#289)

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

Author: renovate[bot]

.github/workflows/build.yml

@@ -24,7 +24,7 @@ jobs:
       - uses: actions/setup-node@v6
         with:
           node-version: '24'
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         with:
           path: 'node_modules'
           key: ${{ runner.os }}-modules-${{ hashFiles('**/package-lock.json') }}
@@ -39,7 +39,7 @@ jobs:
       - uses: actions/setup-node@v6
         with:
           node-version: '24'
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         with:
           path: 'node_modules'
           key: ${{ runner.os }}-modules-${{ hashFiles('**/package-lock.json') }}
@@ -54,7 +54,7 @@ jobs:
       - uses: actions/setup-node@v6
         with:
           node-version: '24'
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         with:
           path: 'node_modules'
           key: ${{ runner.os }}-modules-${{ hashFiles('**/package-lock.json') }}
@@ -69,7 +69,7 @@ jobs:
       - uses: actions/setup-node@v6
         with:
           node-version: '24'
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         with:
           path: 'node_modules'
           key: ${{ runner.os }}-modules-${{ hashFiles('**/package-lock.json') }}