ci: keep docs commits out of releases (#4)

release-please-action@v5 treats docs: as releasable and cut a patch release for a SECURITY.md change. Spell the changelog sections out: feat/fix/perf/revert make a release; docs, refactor, test, build, ci, chore and style are hidden and do not.

Author: AlexeyShalaev

template/release-please-config.json.jinja

@@ -1,5 +1,18 @@
 {
   "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+  "changelog-sections": [
+    { "type": "feat", "section": "Features" },
+    { "type": "fix", "section": "Bug Fixes" },
+    { "type": "perf", "section": "Performance Improvements" },
+    { "type": "revert", "section": "Reverts" },
+    { "type": "docs", "section": "Documentation", "hidden": true },
+    { "type": "refactor", "section": "Code Refactoring", "hidden": true },
+    { "type": "test", "section": "Tests", "hidden": true },
+    { "type": "build", "section": "Build System", "hidden": true },
+    { "type": "ci", "section": "Continuous Integration", "hidden": true },
+    { "type": "chore", "section": "Miscellaneous Chores", "hidden": true },
+    { "type": "style", "section": "Styles", "hidden": true }
+  ],
   "packages": {
     ".": {
       "release-type": "python",