CI: Prevent concurrent builds.

Author: scoder

.github/workflows/ci.yml

@@ -2,7 +2,23 @@ name: CI tests
 
 on:
   push:
-  create:
+    paths:
+      - '**'
+      - '!.github/**'
+      - '.github/workflows/ci.yml'
+  pull_request:
+    paths:
+      - '**'
+      - '!.github/**'
+      - '.github/workflows/ci.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
 
 jobs:
   sdist:
@@ -156,9 +172,7 @@ jobs:
           - "3.10"
           - "3.11"
           - "3.12"
-          # Py3.13.4 currently fails to build on Windows:
-          # https://discuss.python.org/t/heads-up-3-13-5-release-coming-soon/94535
-          - "3.13.5"
+          - "3.13"
           - "3.13t"
           - "3.14-dev"
           - "3.14t-dev"

.github/workflows/wheels.yml

@@ -30,6 +30,10 @@ on:
       - setup.py
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
 permissions: {}
 
 jobs: