Update CI branch

Author: andrjohns

.github/workflows/R-CMD-check-wsl.yaml

@@ -7,7 +7,7 @@ name: Unit tests - WSL Backend
 'on':
   push:
     branches:
-      - gha-wsl2
+      - master
   pull_request:
     branches:
       - master
@@ -17,7 +17,7 @@ jobs:
     if: "! contains(github.event.head_commit.message, '[ci skip]')"
     runs-on: windows-latest
 
-    name: windows-latest-WSLv1
+    name: windows-latest-WSL2
 
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true