fix(ci): make dependencies update bot commit under github-actions account instead of users (ethereum#1686)

Author: KolbyML

.github/workflows/dependencies.yml

@@ -57,6 +57,7 @@ jobs:
         with:
           add-paths: ./Cargo.lock
           commit-message: ${{ steps.msg.outputs.commit_message }}
+          author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
           title: ${{ env.TITLE }}
           body: ${{ steps.msg.outputs.body }}
           branch: ${{ env.BRANCH }}