⚙️ [Maintenance]: Bring workflows into compliance with the GitHub Actions standard (#31)

Brings this repository's inline CI workflows into line with the
organization's [GitHub Actions coding
standard](https://github.com/MSXOrg/docs/blob/main/src/docs/Coding-Standards/GitHub-Actions.md).
Runner images are now pinned to specific versions so a runner upgrade is
a deliberate, reviewable change, and release runs queue instead of
aborting mid-publish.

- Fixes #29

## Changed: runner images are pinned

No workflow uses a `-latest` runner any more; every `runs-on` names a
specific image.

- `Action-Test.yml` — matrix pinned to `ubuntu-24.04`, `windows-2025`,
`macos-15`
- `Linter.yml` — `ubuntu-24.04`
- `Release.yml` — `ubuntu-24.04`

## Changed: release runs queue instead of cancelling

`Release.yml` now sets `cancel-in-progress: false`, so a release that is
publishing queues behind an in-flight run rather than being aborted
mid-write. `Action-Test.yml` and `Linter.yml` keep `cancel-in-progress:
true`, since cancelling a superseded test or lint run is desirable and
is not a publish action.

## Technical Details

Validated locally with `actionlint` (0 issues) on all three workflows;
the linter workflow re-checks `actionlint` in CI.

These workflows are seeded from
[Template-Action](https://github.com/PSModule/Template-Action); the same
corrections should also land there so regenerated repositories stay
compliant (tracked under
[Process-PSModule#360](PSModule/Process-PSModule#360)).

Dependabot update grouping and semver update labels are intentionally
out of scope (see
[MSXOrg/docs#19](MSXOrg/docs#19) and
[PSModule/Process-PSModule#359](PSModule/Process-PSModule#359)).

Author: MariusStorhaug

.github/workflows/Action-Test.yml

@@ -23,7 +23,7 @@ jobs:
   ActionTestBasic:
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-24.04, windows-2025, macos-15]
     name: Action-Test - [Basic]
     runs-on: ${{ matrix.os }}
     steps:

.github/workflows/Linter.yml

@@ -16,7 +16,7 @@ permissions:
 jobs:
   Lint:
     name: Lint code base
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout repo
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0

.github/workflows/Release.yml

@@ -18,15 +18,15 @@ on:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
+  cancel-in-progress: false
 
 permissions:
   contents: write # Required to create releases
   pull-requests: write # Required to create comments on the PRs
 
 jobs:
   Release:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout repo
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0