Bump actions/cache from 5 to 6

Bumps [actions/cache](https://github.com/actions/cache) from 5 to 6.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v5...v6)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/deno-ci.yaml

@@ -34,7 +34,7 @@ jobs:
         deno-version: ${{ matrix.deno-version }}
 
     - name: Cache Deno deps
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       with:
         path: ~/.cache/deno
         key: denodir/${{ matrix.deno-version }}-${{ hashFiles('deno.lock') }}
@@ -67,7 +67,7 @@ jobs:
     - uses: actions/checkout@v7
 
     - name: Cache Deno deps
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       with:
         path: ~/.cache/deno
         key: denodir-${{ hashFiles('deno.lock') }}
@@ -91,7 +91,7 @@ jobs:
     - uses: actions/checkout@v7
 
     - name: Cache Deno deps
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       with:
         path: ~/.cache/deno
         key: denodir-${{ hashFiles('deno.lock') }}