chore: pull request template

Author: ldez

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,10 @@
+<!--
+
+WARNING:
+
+We use Dependabot to update dependencies (linters included).
+The updates happen at least automatically once a week (Sunday 11am UTC).
+
+No pull requests to update a linter will be accepted unless you are the author of the linter AND specific changes are required.
+
+-->