Bump actions/setup-dotnet from 4 to 5 in /.github/workflows

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 4 to 5.
- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](actions/setup-dotnet@v4...v5)

---
updated-dependencies:
- dependency-name: actions/setup-dotnet
  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/csharp_test.yml

@@ -40,7 +40,7 @@ jobs:
       with:
         submodules: true
         ref: ${{ inputs.checkout-ref || github.head_ref }}
-    - uses: actions/setup-dotnet@v4
+    - uses: actions/setup-dotnet@v5
       with:
         dotnet-version: 9
     - uses: actions/cache/restore@v4
@@ -71,7 +71,7 @@ jobs:
       with:
         submodules: true
         ref: ${{ inputs.checkout-ref || github.head_ref }}
-    - uses: actions/setup-dotnet@v4
+    - uses: actions/setup-dotnet@v5
       with:
         dotnet-version: 9
     - uses: actions/cache/restore@v4
@@ -104,7 +104,7 @@ jobs:
       with:
         submodules: true
         ref: ${{ inputs.checkout-ref || github.head_ref }}
-    - uses: actions/setup-dotnet@v4
+    - uses: actions/setup-dotnet@v5
       with:
         dotnet-version: 9
     - run: make format/check