chore(deps): pin dawidd6/action-send-mail action (#175)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -181,7 +181,7 @@ jobs:
           egress-policy: audit
 
       - name: Send email notification
-        uses: dawidd6/action-send-mail@v3
+        uses: dawidd6/action-send-mail@4226df7daafa6fc901a43789c49bf7ab309066e7 # v3
         with:
           server_address: smtp.gmail.com
           server_port: 587