Exclude NOTICE files from merge conflict detection. (#8498) (#8534)

(cherry picked from commit d3bc5d9)

Co-authored-by: Craig MacKenzie <[email protected]>

Author: mergify[bot]

.pre-commit-config.yaml

@@ -8,3 +8,4 @@ repos:
         exclude: (.*/.*.(tmpl|tftpl)$)
     -   id: check-merge-conflict
         args: ['--assume-in-merge']
+        exclude: (^NOTICE.*\.txt$)