Fix casing in runs-on for consistency

Author: Morcules

.github/workflows/run_all_tests.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   build:
 
-    runs-on: [self-hosted, linux, macOS, ARM64]
+    runs-on: [self-hosted, Linux, macOS, ARM64]
 
     steps:
     - uses: actions/checkout@v4