Upgrade renovate to 36.32.0

This also includes a switch to PNPM from yarn, for building renovate itself.

Here is a filtered changelog of interesting items:

Features

• platform/gitlab: support autoApprove option (#23460) (cdf1db7) {36.27.0}
  • Note: We don't make use of autoApprove, so 🤷

Bug Fixes

• rubygems: Use cascade of endpoints for unknown servers (#23523) (992b336) {36.23.1}
  • Note: Shouldn't matter to us, as we only use the public registry

Build System

• deps: update dependency @renovatebot/ruby-semver to v3.0.10 (#23701) (9b0b317) {36.32.0}
  • Note: No big changes: https://app.renovatebot.com/package-diff?name=@renovatebot/ruby-semver&from=3.0.4&to=3.0.10

I posted a full changelog in a comment below.