chore(deps): update release-please to v4

[pichlermarc]

Which problem is this PR solving?

• updates release-please to v4
• remove "command: manifest" as it's the default option now

Supersedes #1853

[codecov]

Codecov Report

Merging #1901 (1daeda8) into main (32204a3) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 1daeda8 differs from pull request most recent head 6ca976a. Consider uploading reports for the commit 6ca976a to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1901   +/-   ##
=======================================
  Coverage   91.50%   91.51%           
=======================================
  Files         145      145           
  Lines        7431     7427    -4     
  Branches     1489     1486    -3     
=======================================
- Hits         6800     6797    -3     
+ Misses        631      630    -1     

see 1 file with indirect coverage changes