Hash only the root lockfile in the migration cache key

Author: icecrasher321

.github/workflows/migrations.yml

@@ -44,7 +44,7 @@ jobs:
             ~/.bun/install/cache
             node_modules
             **/node_modules
-          key: ${{ runner.os }}-bun-${{ hashFiles('**/bun.lock') }}
+          key: ${{ runner.os }}-bun-${{ hashFiles('bun.lock') }}
           restore-keys: |
             ${{ runner.os }}-bun-