chore: add bump-major-pre-major to keep pre-1.0 versioning

Author: lilienblum

release-please-config.json

@@ -2,6 +2,7 @@
   "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
   "release-type": "simple",
   "bump-minor-pre-major": true,
+  "bump-major-pre-major": true,
   "include-v-in-tag": true,
   "changelog-sections": [
     { "type": "feat", "section": "Features" },