Adjust Renovate PR Concurrency (#2402)

You are getting flooded with `renovate` bot PRs. Instead of allowing
that crazy bot to do whatever it wants, set some boundaries. This PR
sets the total concurrent PRs from this over-caffeinated bot to just 2.

That is all good, but you will want to keep you eyes on the [dependency
dashboard](#1605) so you
don't fall behind on important PRs from `renovate`. This tool provides
you everything you need to manage creation of said PRs.

Renovate `not-pending` docs
https://docs.renovatebot.com/faq/#wait-until-tests-have-passed-before-creating-a-pr-but-create-the-pr-even-if-they-fail
____

#### Screens

--

#### Breaking Changes

No

#### Runway Ticket URL

Nope

#### How to test this

Merge it and see how awesome it is.

#### Checklist:

- [ ] **LABELS** Add a label: `enhancement`, `bug`, `improvement`, `new
kit`, `deprecated`, or `breaking`. See [Changelog &
Labels](https://github.com/powerhome/playbook/wiki/Changelog-&-Labels)
for details.
- [ ] **DEPLOY** Please add the `Milano` label when you are ready for a
review.
- [ ] **SCREENSHOT** Please add a screen shot or two.
- [ ] **SPECS** Please cover your changes with specs.
- [ ] **READ DOCS** Please make sure you have read and understand the
[Playbook Release
Process](https://github.com/powerhome/playbook/wiki/Playbook-Releases)

Co-authored-by: Jasper Furniss <jasper.furniss@powerhrg.com>

renovate.json

@@ -5,6 +5,8 @@
   "major": {
     "enabled": false
   },
+  "prCreation": "not-pending",
+  "prConcurrentLimit": 2,
   "packageRules": [
     {
       "packageNames": [