��Prepare support for vendored dependencies (#7039)

* Temporarily use custom branch of dd-license-attribution

* Use new --yarn-subdir arg for dd-license-attribution

Author: watson

.github/workflows/update-3rdparty-licenses.yml

@@ -37,8 +37,8 @@ jobs:
       - name: Check out dd-license-attribution
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
-          repository: DataDog/dd-license-attribution
-          ref: 8a4624fd08a16717ffbf92d389e65fa609a4f067
+          repository: watson/dd-license-attribution
+          ref: f529f30734809b971799002cb6e4fa1bb039a359
           path: dd-license-attribution
 
       - name: Install dd-license-attribution
@@ -71,6 +71,7 @@ jobs:
             --use-mirrors=mirrors.json \
             --no-scancode-strategy \
             --no-github-sbom-strategy \
+            --yarn-subdir vendor \
             "${REPOSITORY_URL}" > LICENSE-3rdparty.csv
 
       - name: Append vendored dependencies