[ci] Concurrency optimizations (#8614)

Authored by: Grub4K

.github/workflows/core.yml

@@ -3,6 +3,10 @@ on: [push, pull_request]
 permissions:
   contents: read
 
+concurrency:
+  group: core-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   tests:
     name: Core Tests

.github/workflows/release-master.yml

@@ -10,7 +10,6 @@ on:
       - "pyinst.py"
 concurrency:
   group: release-master
-  cancel-in-progress: true
 permissions:
   contents: read