Bump mshick/add-pr-comment from 2.8.2 to 3.9.0 (#2821)

Bumps [mshick/add-pr-comment](https://github.com/mshick/add-pr-comment)
from 2.8.2 to 3.9.0.

Author: dependabot[bot]

.github/workflows/build-sphinx.yml

@@ -224,7 +224,7 @@ jobs:
         if: env.GH_EVENT_OPEN_PR_UPSTREAM == 'true'
         env:
           PR_NUM: ${{ github.event.number }}
-        uses: mshick/add-pr-comment@b8f338c590a895d50bcbfa6c5859251edc8952fc # v2.8.2
+        uses: mshick/add-pr-comment@ffd016c7e151d97d69d21a843022fd4cd5b96fe5 # v3.9.0.8.3.9.0
         with:
           message-id: url_to_docs
           message: |
@@ -268,7 +268,7 @@ jobs:
           git push tokened_docs gh-pages
 
       - name: Modify the comment with URL to official documentation
-        uses: mshick/add-pr-comment@b8f338c590a895d50bcbfa6c5859251edc8952fc # v2.8.2
+        uses: mshick/add-pr-comment@ffd016c7e151d97d69d21a843022fd4cd5b96fe5 # v3.9.0.8.3.9.0
         with:
           message-id: url_to_docs
           find: |

.github/workflows/conda-package.yml

@@ -654,7 +654,7 @@ jobs:
 
       - name: Post result to PR
         if: ${{ github.event.pull_request && !github.event.pull_request.head.repo.fork }}
-        uses: mshick/add-pr-comment@b8f338c590a895d50bcbfa6c5859251edc8952fc # v2.8.2
+        uses: mshick/add-pr-comment@ffd016c7e151d97d69d21a843022fd4cd5b96fe5 # v3.9.0.8.3.9.0
         with:
           message-id: array_api_results
           message: |