Bump actions/checkout from 2 to 3 (#2740)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2...v3)

---
updated-dependencies:
- dependency-name: actions/checkout
  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>

.github/workflows/build-frontends.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         fetch-depth: 0
     - name: Setup .NET

.github/workflows/build-ilspy.yml

@@ -22,7 +22,7 @@ jobs:
       
     - name: Force git to use crlf, otherwise dotnet-format --check fails
       run: git config --global core.autocrlf true
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         submodules: true
         fetch-depth: 0

.github/workflows/generate-bom.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
     - name: Checkout
       run: git config --global core.autocrlf true
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         submodules: true