build(deps): bump actions/cache from 5 to 6 (#337)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/benchmark.yml

@@ -64,7 +64,7 @@ jobs:
             10.x
 
       - name: Cache NuGet packages
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.nuget/packages
           key: nuget-${{ runner.os }}-${{ hashFiles('Directory.Packages.props', '**/*.fsproj', '**/*.csproj') }}

.github/workflows/ci.yaml

@@ -48,7 +48,7 @@ jobs:
             10.x
 
       - name: Cache NuGet packages
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.nuget/packages
           key: nuget-${{ runner.os }}-${{ hashFiles('Directory.Packages.props', '**/*.fsproj', '**/*.csproj') }}
@@ -85,7 +85,7 @@ jobs:
           dotnet-version: 10.x
 
       - name: Cache NuGet packages
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.nuget/packages
           key: nuget-${{ runner.os }}-${{ hashFiles('Directory.Packages.props', '**/*.fsproj', '**/*.csproj') }}