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](swift-actions/setup-swift@v1.19.0...v1.20.0)

---
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>

.github/workflows/docs.yml

@@ -40,7 +40,7 @@ jobs:
     outputs:
       package-dump: ${{ steps.dump-package.outputs.package-dump }}
     steps:
-      - uses: swift-actions/setup-swift@v1.19.0
+      - uses: swift-actions/setup-swift@v1.20.0
         with:
           swift-version: '5.7'
       - uses: actions/checkout@v3.1.0
@@ -62,7 +62,7 @@ jobs:
       matrix:
         target: ${{ fromJson(needs.spm-context.outputs.package-dump).products.*.targets.* }}
     steps:
-      - uses: swift-actions/setup-swift@v1.19.0
+      - uses: swift-actions/setup-swift@v1.20.0
         id: swift-setup
         with:
           swift-version: '5.7'