Upgrade sbt-org-policies and use bundled releases

[cb372]

Sonatype bundle releases should work with this version of sbt-org-policies, because it brings in a transitive dependency on sbt-sonatype v3.8.1.

Using bundled releases means our artifacts will upload to Sonatype more quickly.

What this does?

Changes, features, fixes ...

Checklist

• Reviewed the diff to look for typos, println and format errors.
• Updated the docs accordingly.

[codecov]

Codecov Report

Merging #751 into master will increase coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #751      +/-   ##
==========================================
+ Coverage   80.91%   81.26%   +0.34%     
==========================================
  Files          73       73              
  Lines        1158     1158              
  Branches       14       14              
==========================================
+ Hits          937      941       +4     
+ Misses        221      217       -4

Impacted Files	Coverage Δ
...kindness/mu/rpc/idlgen/avro/AvroSrcGenerator.scala	76.66% <0%> (+6.66%)	⬆️

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