[actions] Trigger website build targetting branch 'main'.

Author: springcomp

.github/workflows/update_website.yaml

@@ -14,6 +14,6 @@ jobs:
             owner: 'jmespath-community',
             repo: 'jmespath.site',
             workflow_id: 'build.yaml',
-            ref: 'master',
+            ref: 'main',
             inputs: { version: '${{ github.ref_name }}' }
           })