Pin GHA runner versions

The list of the runner versions is available here:
https://docs.github.com/en/actions/reference/runners/github-hosted-runners

Author: SkypLabs

.github/workflows/test_and_publish.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   is-duplicate:
     name: Is Duplicate
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     outputs:
       should_skip: ${{ steps.skip-check.outputs.should_skip }}
     permissions:
@@ -30,7 +30,12 @@ jobs:
     if: needs.is-duplicate.outputs.should_skip != 'true'
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        # List of runner versions:
+        # https://docs.github.com/en/actions/reference/runners/github-hosted-runners
+        os: [ubuntu-24.04, macos-26-intel, windows-2025]
+
+        # List of Python versions:
+        # https://devguide.python.org/versions/
         python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
@@ -67,7 +72,9 @@ jobs:
       )
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        # List of runner versions:
+        # https://docs.github.com/en/actions/reference/runners/github-hosted-runners
+        os: [ubuntu-24.04, macos-26-intel, windows-2025]
 
     steps:
       - name: Check out code
@@ -86,7 +93,7 @@ jobs:
 
   build-sdist:
     name: Build source distribution
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: test-code
     if: |
       !failure() &&
@@ -118,7 +125,7 @@ jobs:
   publish-to-test-pypi:
     name: Publish to TestPyPI
     environment: staging
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: [build-sdist, build-wheels]
     if: |
       !failure() &&
@@ -143,7 +150,7 @@ jobs:
   publish-to-pypi:
     name: Publish to PyPI
     environment: production
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: [publish-to-test-pypi]
     if: |
       !failure() &&