Bump swift-actions/setup-swift from 1.19.0 to 1.20.0 (#1415)

* Bump swift-actions/setup-swift from 1.19.0 to 1.20.0

Bumps [swift-actions/setup-swift](https://github.com/swift-actions/setup-swift) from 1.19.0 to 1.20.0.
- [Release notes](https://github.com/swift-actions/setup-swift/releases)
- [Commits](5cdaa9161a...194625b58a)

---
updated-dependencies:
- dependency-name: swift-actions/setup-swift
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update setup-swift SHA in non-autogenerated files

* Specify v5.7.0 instead of 5.7

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Angela P Wen <angelapwen@github.com>

pr-checks/checks/swift-custom-build.yml

@@ -6,11 +6,11 @@ env:
   CODEQL_ENABLE_EXPERIMENTAL_FEATURES_SWIFT: "true"
   DOTNET_GENERATE_ASPNET_CERTIFICATE: "false"
 steps:
-  - uses: swift-actions/setup-swift@5cdaa9161ad1f55ae39a5ea1784ef96de72f95d9
+  - uses: swift-actions/setup-swift@194625b58a582570f61cc707c3b558086c26b723
     # Only macOS latest and nightly-latest support Swift 5.7.1
     if: runner.os == 'Linux' || matrix.version == 'cached'
     with:
-      swift-version: "5.7"
+      swift-version: "5.7.0"
   - uses: ./../action/init
     with:
       languages: swift