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/build-and-test.yml

@@ -35,7 +35,7 @@ jobs:
     - name: Setup .NET
       uses: ./.github/actions/setup-dotnet
     - name: Setup Dependency Caching
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       id: nuget-cache
       with:
         path: |

.github/workflows/copilot-setup-steps.yml

@@ -29,7 +29,7 @@ jobs:
       with:
         dotnet-version: 8.x
     - name: Setup Dependency Caching
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       id: nuget-cache
       with:
         path: |

.github/workflows/deploy.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Setup .NET
       uses: ./.github/actions/setup-dotnet
     - name: Setup Dependency Caching
-      uses: actions/cache@v5
+      uses: actions/cache@v6
       id: nuget-cache
       with:
         path: |