test: replace bitnami/cassandra imgage with cassandra

[pichlermarc]

Which problem is this PR solving?

Replaces bitnami/cassandra:3 with cassandra:3, since tags from bitnami/cassandra are being retired. We already use the cassandra:3 image in local test files.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.55%. Comparing base (6d1795b) to head (00dd179).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3000      +/-   ##
==========================================
- Coverage   97.62%   89.55%   -8.07%     
==========================================
  Files           9      193     +184     
  Lines         505     9698    +9193     
  Branches       89     2011    +1922     
==========================================
+ Hits          493     8685    +8192     
- Misses         12     1013    +1001     

see 184 files with indirect coverage changes

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