Disable warnings as errors on 6.0

Motivation: We currently have a range of thread-safety warnings on Swift 6.0 (which will be errors in Swift 6 Language mode). Resolving these is out of scope for CI work. Modifications: Disabled warnings-as-errors on Swift 6 CI pipelines Result: Resolve Swift 6 CI failures.

Author: rnro

.github/workflows/main.yml

@@ -11,9 +11,8 @@ jobs:
  name: Unit tests
  uses: apple/swift-nio/.github/workflows/unit_tests.yml@main
  with:
- linux_5_8_enabled: false
  linux_5_9_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
  linux_5_10_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
- linux_6_0_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
+ linux_6_0_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
  linux_nightly_6_0_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
  linux_nightly_main_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"

.github/workflows/pull_request.yml

@@ -16,7 +16,7 @@ jobs:
  with:
  linux_5_9_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
  linux_5_10_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
- linux_6_0_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
+ linux_6_0_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
  linux_nightly_6_0_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
  linux_nightly_main_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
 

.licenseignore

@@ -33,3 +33,5 @@ Dockerfile
 .dockerignore
 Snippets/*
 dev/git.commit.template
+.unacceptablelanguageignore
+Tests/AsyncHTTPClientTests/Resources/*.pem

.swift-format

@@ -18,6 +18,12 @@
  "maximumBlankLines" : 1,
  "respectsExistingLineBreaks" : true,
  "prioritizeKeepingFunctionOutputTogether" : true,
+ "noAssignmentInExpressions" : {
+ "allowedFunctions" : [
+ "XCTAssertNoThrow",
+ "XCTAssertThrowsError"
+ ]
+ },
  "rules" : {
  "AllPublicDeclarationsHaveDocumentation" : false,
  "AlwaysUseLiteralForEmptyCollectionInit" : false,