Merge pull request ossf#129 from ossf/default_branch_main

CHange workflow default branch to 'main'

Author: david-a-wheeler

.github/workflows/linter.yml

@@ -47,7 +47,7 @@ jobs:
         uses: github/super-linter@v4
         env:
           VALIDATE_ALL_CODEBASE: false
-          DEFAULT_BRANCH: master
+          DEFAULT_BRANCH: main
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           VALIDATE_MARKDOWN: true
           MARKDOWN_CONFIG_FILE: .markdown-lint.yml