Use Swift version 5.7 in PR checks

The version installed in the latest runner image, 5.7.1, is not yet
supported.

Author: henrymercer

.github/workflows/__export-file-baseline-information.yml

@@ -2,6 +2,9 @@ name: "Export file baseline information"
 description: "Tests that file baseline information is exported when the feature is enabled"
 versions: ["nightly-latest"]
 steps:
+  - uses: swift-actions/setup-swift@v1
+    with:
+      swift-version: 5.7
   - uses: ./../action/init
     with:
       languages: javascript

.github/workflows/__multi-language-autodetect.yml

@@ -4,6 +4,9 @@ operatingSystems: ["ubuntu", "macos"]
 env:
   CODEQL_ENABLE_EXPERIMENTAL_FEATURES_SWIFT: "true" # Remove when Swift is GA.
 steps:
+  - uses: swift-actions/setup-swift@v1
+    with:
+      swift-version: 5.7
   - uses: ./../action/init
     with:
       db-location: "${{ runner.temp }}/customDbLocation"

.github/workflows/__swift-autobuild.yml

@@ -6,6 +6,9 @@ operatingSystems: ["macos"]
 env:
   CODEQL_ENABLE_EXPERIMENTAL_FEATURES_SWIFT: "true"
 steps:
+  - uses: swift-actions/setup-swift@v1
+    with:
+      swift-version: 5.7
   - uses: ./../action/init
     with:
       languages: swift

.github/workflows/__swift-custom-build.yml

@@ -6,6 +6,9 @@ env:
   CODEQL_ENABLE_EXPERIMENTAL_FEATURES_SWIFT: "true"
   DOTNET_GENERATE_ASPNET_CERTIFICATE: "false"
 steps:
+  - uses: swift-actions/setup-swift@v1
+    with:
+      swift-version: 5.7
   - uses: ./../action/init
     with:
       languages: swift