Bump actions/setup-dotnet from 1.8.2 to 1.9.0 (Azure#5259)

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 1.8.2 to 1.9.0.
- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](actions/setup-dotnet@v1.8.2...v1.9.0)

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

@@ -78,7 +78,7 @@ jobs:
  submodules: true
 
  - name: Setup .NET Core
- uses: actions/setup-dotnet@v1.8.2
+ uses: actions/setup-dotnet@v1.9.0
 
  - name: Build
  run: dotnet build --configuration ${{ matrix.configuration }}
@@ -236,7 +236,7 @@ jobs:
  submodules: true
 
  - name: Setup .NET Core
- uses: actions/setup-dotnet@v1.8.2
+ uses: actions/setup-dotnet@v1.9.0
 
  - name: Download Bicep CLI
  uses: actions/download-artifact@v2
@@ -295,7 +295,7 @@ jobs:
  submodules: true
 
  - name: Setup .NET Core
- uses: actions/setup-dotnet@v1.8.2
+ uses: actions/setup-dotnet@v1.9.0
 
  - name: Setup Node.js
  uses: actions/[email protected]
@@ -460,7 +460,7 @@ jobs:
  submodules: true
 
  - name: Setup .NET Core
- uses: actions/setup-dotnet@v1.8.2
+ uses: actions/setup-dotnet@v1.9.0
 
  - name: Setup Node.js
  uses: actions/[email protected]
@@ -497,7 +497,7 @@ jobs:
  submodules: true
 
  - name: Setup .NET Core
- uses: actions/setup-dotnet@v1.8.2
+ uses: actions/setup-dotnet@v1.9.0
 
  - name: Setup Node.js
  uses: actions/[email protected]

.github/workflows/update-baselines.yml

@@ -23,7 +23,7 @@ jobs:
  fetch-depth: 0 # avoid shallow clone so nbgv can do its work.
 
  - name: Setup .NET Core
- uses: actions/setup-dotnet@v1.8.2
+ uses: actions/setup-dotnet@v1.9.0
 
  - name: Test
  continue-on-error: true