chore: configure renovate to only run on master branch

[ryemorris]

Currently, mintmaker will try to update all onboarded components but this is unnecessary for SC branches and just clutters the repo PR list. Only allowing renovate to run on main/master should help.

Summary by Sourcery

Chores:

• Configure Renovate to only run on main/master branch

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds a root-level renovate.json to restrict renovate’s execution to only the master (or main) branch by specifying allowed baseBranches and disabling updates on other branches.

File-Level Changes

Change	Details	Files
Introduce renovate.json to limit renovate runs to master branch	Create a new renovate.json at the repo root Set baseBranches (or branchRules) to only allow main/master Disable update schedules on all other branches	renovate.json

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[sourcery-ai]

Hey @ryemorris - I've reviewed your changes and they look great!

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