[CI] add renovate config

[sean-breen]

Proposed changes

Adds renovate configuration file

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.02%. Comparing base (6cbcd8b) to head (585f2ad).
⚠️ Report is 31 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1474      +/-   ##
==========================================
- Coverage   85.15%   85.02%   -0.14%     
==========================================
  Files         102      103       +1     
  Lines       12984    13587     +603     
==========================================
+ Hits        11057    11552     +495     
- Misses       1440     1518      +78     
- Partials      487      517      +30     

see 50 files with indirect coverage changes

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