don't fetch entire history for test runs

Author: rashley-iqt

.github/workflows/test-secret-scan.yml

@@ -8,12 +8,15 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v4
+      with:
+          fetch-depth: 1
     - name: Checkout Test Data
       uses: actions/checkout@v4
       with:
         repository: trufflesecurity/test_keys
         path: test_keys
         clean: false
+        fetch-depth: 1
     - name: Scan Test Data
       id: scan
       uses: ./secret-scan