Removed all workflows for Swift 5

Fixes #102

Author: dimitribouniol

.github/workflows/main.yml

@@ -9,5 +9,6 @@ jobs:
     name: Unit tests
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
+      exclude_swift_versions: "[{\"swift_version\": \"5.8\"}, {\"swift_version\": \"5.9\"}, {\"swift_version\": \"5.10\"}]"
       swift_flags: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
       swift_nightly_flags: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"

.github/workflows/pull_request.yml

@@ -19,5 +19,7 @@ jobs:
     name: Unit tests
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
+      linux_exclude_swift_versions: "[{\"swift_version\": \"5.8\"}, {\"swift_version\": \"5.9\"}, {\"swift_version\": \"5.10\"}]"
+      windows_exclude_swift_versions: "[{\"swift_version\": \"5.8\"}, {\"swift_version\": \"5.9\"}, {\"swift_version\": \"5.10\"}]"
       swift_flags: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
       swift_nightly_flags: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"