COMP: Fix lint workflow — action default branch renamed to main

ITKClangFormatLinterAction repo renamed its default branch from
`master` to `main`. The lint workflow referenced `@master` which
no longer resolves.

Author: hjmjohnson

.github/workflows/lint.yml

@@ -14,7 +14,7 @@ jobs:
         fetch-depth: 0
 
     - name: Lint C++
-      uses: InsightSoftwareConsortium/ITKClangFormatLinterAction@master
+      uses: InsightSoftwareConsortium/ITKClangFormatLinterAction@main
 
     - name: Set up Python
       uses: actions/setup-python@v5