dev: bump actions/cache from 4 to 5

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 5.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/go.yaml

@@ -23,7 +23,7 @@ jobs:
       with:
         go-version: '~1.24'
     - name: Initialize Go module cache
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
@@ -53,7 +53,7 @@ jobs:
       with:
         go-version: '~1.24'
     - name: Initialize Go module cache
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}