chore: update renovate match rules

[grant]

We have a few too many PRs that are minor/patch versions without significant updates.

This PR adds a schema to the renovate config and sets the package rules to group minor/patch PRs.

Automerge true also didn't work as expected - it is removed here.

References:

• https://docs.renovatebot.com/presets-group/#groupallnonmajor
• https://stackoverflow.com/questions/66471226/renovate-combine-all-updates-to-one-branch-pr

See:

• https://github.com/GoogleCloudPlatform/functions-framework-nodejs/pull/451
• https://github.com/GoogleCloudPlatform/functions-framework-nodejs/pull/449
• https://github.com/GoogleCloudPlatform/functions-framework-nodejs/pull/448
• https://github.com/GoogleCloudPlatform/functions-framework-nodejs/pull/447
• https://github.com/GoogleCloudPlatform/functions-framework-nodejs/pull/446
• https://github.com/GoogleCloudPlatform/functions-framework-nodejs/pull/445
• https://github.com/GoogleCloudPlatform/functions-framework-nodejs/pull/444
• https://github.com/GoogleCloudPlatform/functions-framework-nodejs/pull/443
• https://github.com/GoogleCloudPlatform/functions-framework-nodejs/pull/442
• https://github.com/GoogleCloudPlatform/functions-framework-nodejs/pull/441