docs: Add automatic release notes config file

* Add a .github/release.yml file to configure the automatic release notes
  that GitHub can generate on a release.
   - https://docs.github.com/en/repositories/releasing-projects-on-github/automatically-generated-release-notes
* Ignore contributions from Dependabot and pre-commit-ci from the
  release notes.

.github/release.yml

@@ -0,0 +1,5 @@
+changelog:
+  exclude:
+    authors:
+      - dependabot
+      - pre-commit-ci