Actions: Use main branch (#202)

Author: ryonakano

.github/workflows/main.yml

@@ -40,4 +40,4 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - uses: elementary/actions/vala-lint@master
+    - uses: elementary/actions/vala-lint@main

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
        uses: actions/checkout@v4
 
      - name: Release
-       uses: elementary/actions/release@master
+       uses: elementary/actions/release@main
        env:
          GIT_USER_TOKEN: "${{ secrets.GIT_USER_TOKEN }}"
          GIT_USER_NAME: "elementaryBot"