Revert "ci: switch to $default-branch"

This reverts commit 37fc0ac.

Author: knopki

.github/workflows/build-and-test.yml

@@ -3,9 +3,9 @@ name: Build and test pyfactxx
 on:
   workflow_dispatch:
   push:
-    branches: [$default-branch, "wheels"]
+    branches: [master, "wheels"]
   pull_request:
-    branches: [$default-branch, "wheels"]
+    branches: [master, "wheels"]
 
 permissions:
   contents: read # access to check out code and install dependencies

.github/workflows/codacy-analysis.yml

@@ -2,10 +2,10 @@ name: Codacy Security Scan
 
 on:
   push:
-    branches: [$default-branch]
+    branches: [master]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [$default-branch]
+    branches: [master]
   schedule:
     - cron: "32 23 * * 5"
 

.github/workflows/codeql-analysis.yml

@@ -2,10 +2,10 @@ name: "CodeQL"
 
 on:
   push:
-    branches: [$default-branch]
+    branches: [master]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [$default-branch]
+    branches: [master]
   schedule:
     - cron: "30 3 * * 0"