CI: Maintenance, this and that

[amotl]

• Increase frequency of Dependabot checks to "weekly".
• Naming things. Use Release: prefix for all release jobs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.04%. Comparing base (a654983) to head (2ec2e12).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #187   +/-   ##
=======================================
  Coverage   72.04%   72.04%           
=======================================
  Files          79       79           
  Lines        3209     3209           
=======================================
  Hits         2312     2312           
  Misses        897      897           

Flag	Coverage Δ
main	59.98% <ø> (ø)
pymongo	42.34% <ø> (ø)

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