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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: oven-sh/setup-bun@v2
         with: { bun-version: latest }
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         id: cache-deps
         with:
           path: |
@@ -45,7 +45,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - uses: oven-sh/setup-bun@v2
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         with:
           path: |
             ${{ env.BUN_CACHE }}
@@ -61,7 +61,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: oven-sh/setup-bun@v2
         with: { bun-version: latest }
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         with:
           path: |
             ${{ env.BUN_CACHE }}
@@ -78,7 +78,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: oven-sh/setup-bun@v2
         with: { bun-version: latest }
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         with:
           path: |
             ${{ env.BUN_CACHE }}