Add summary of dependency review as comment in the PR (nginx#753)

Adds additional config option to add the summary of the dependency
changes as a comment in the PR.
The additional permission of 'pull-requests: write' is required to post
the comment.

Author: miledxz

.github/dependency-review-config.yml

@@ -10,3 +10,4 @@ allow_licenses:
   - OpenSSL
   - Python-2.0
   - X11
+comment-summary-in-pr: true

.github/workflows/dependency-review.yml

@@ -7,6 +7,9 @@ permissions:
 jobs:
   dependency-review:
     runs-on: ubuntu-22.04
+    permissions:
+      contents: read
+      pull-requests: write
     steps:
       - name: "Checkout Repository"
         uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3