Add renovate configuration

[jashparekh]

Description

• Add renovate configuration
• Add github-action for validating renovate configuration
• Add configuration for bandit

Closes #6

Type of Change

• Bug Fix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe)

Checklist

• I have read the contributing guidelines
• Existing issues have been referenced (where applicable)
• I have verified this change is not present in other open pull requests
• Functionality is documented
• All code style checks pass
• New code contribution is covered by automated tests
• All new and existing tests pass

[codecov]

Codecov Report

Merging #7 (ea2ef4a) into main (eb711a4) will decrease coverage by 0.28%.
The diff coverage is n/a.

❗ Current head ea2ef4a differs from pull request most recent head a31a193. Consider uploading reports for the commit a31a193 to get more accurate results

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   92.59%   92.30%   -0.29%     
==========================================
  Files           2        1       -1     
  Lines          54       52       -2     
==========================================
- Hits           50       48       -2     
  Misses          4        4              

Impacted Files	Coverage Δ
avro_to_bigquery/__init__.py

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[draco2003]

LGTM