### Motivation:
Correct the link of sswg-security at SECURITY.md. Currently it is
showing "Not Found".

### Modifications:
+
https://github.com/swift-server/sswg/blob/main/process/incubation.md#security-best-practices
=> https://www.swift.org/sswg/security/

### Result:
Correct the link of sswg-security

### Motivation

Support the transport in Mac Catalyst apps.

### Modifications

Add the platform requirement to Package.swift.

### Result

Builds correctly for Mac Catalyst now.

### Test Plan

Unit tests passed.

### Motivation

The `public` modifier of members in an extension of an internal type
doesn't actually make them public, and can be confusing when reading the
code.

### Modifications

Remove the public modifiers.

### Result

Less confusing code.

### Test Plan

Tests still pass.

add .editorconfig file

Enable MemberImportVisibility check on all targets. Use a standard
string header and footer to bracket the new block for ease of updating
in the future with scripts.

Update the release.yml file with the latest label changes

CI use 6.1 nightlies now that Swift development is happening in the 6.1
branch

Rename nightly_6_1 params to nightly_next; see
apple/swift-nio#3122

Only apply standard swift settings on valid targets. The current check
ignores plugins but that is not comprehensive enough.

Enable macOS CI on merge to main and daily timer

### Motivation:

* Improve test coverage
* Check test pass/fail status
* Monitor CI throughput

### Modifications:

Enable macOS CI to be run on all merges to main and on a daily timer.

### Result:

Improved test coverage run out-of-band at the moment so we can get a
feeling for if any changes need to be made in the repo or in the CI
pipelines to ensure timely and stable checks.

Motivation:

* Improve test coverage

Modifications:

Enable macOS CI to be run on pull request commits and make the use of
the nightly runner pool for main.yml jobs explicit.

Result:

Improved test coverage.

Implement the lock primitive.