fix: fix action

Author: neocybereth

.github/workflows/check-validityops.yml

@@ -32,7 +32,7 @@ jobs:
           curl -s \
           --form-string "token=${{ secrets.PUSHOVER_TOKEN }}" \
           --form-string "user=${{ secrets.PUSHOVER_USER_KEY }}" \
-          --form-string "message=ALERT: ValidityOps is down!!" \
+          --form-string "message=ALERT: ValidityOps is down." \
           --form-string "title=Site Check Failure" \
           --form-string "priority=1" \
           https://api.pushover.net/1/messages.json