Bump martincostello/update-dotnet-sdk from 3.3.0 to 3.4.0 (#473)

Bumps [martincostello/update-dotnet-sdk](https://github.com/martincostello/update-dotnet-sdk) from 3.3.0 to 3.4.0.
- [Release notes](https://github.com/martincostello/update-dotnet-sdk/releases)
- [Commits](martincostello/update-dotnet-sdk@0bc908e...76e2c0d)

---
updated-dependencies:
- dependency-name: martincostello/update-dotnet-sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/update-dotnet-sdk.yml

@@ -26,7 +26,7 @@ jobs:
 
     - name: Update .NET SDK
       id: update-dotnet-sdk
-      uses: martincostello/update-dotnet-sdk@0bc908ef15be678a94bc7bf92f742bbaff67337e # v3.3.0
+      uses: martincostello/update-dotnet-sdk@76e2c0df2303d4f6a404228105ebb7d60ace0556 # v3.4.0
       with:
         labels: 'dependencies,.NET'
         repo-token: ${{ secrets.ACCESS_TOKEN }}