removing psalm security analysis workflow

[brettmc]

we already run psalm in the php workflow. this one doesn't add much, and is more flaky. we have decided that the serif uploading is not very important since we have good makefile-based ability for devs to run this all locally before pushing

[codecov]

Codecov Report

Merging #799 (615d76f) into main (3ac64f6) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #799   +/-   ##
=========================================
  Coverage     80.40%   80.40%           
  Complexity     1765     1765           
=========================================
  Files           222      222           
  Lines          4516     4516           
=========================================
  Hits           3631     3631           
  Misses          885      885           

Flag	Coverage Δ
7.4	80.40% <ø> (ø)
8.0	80.43% <ø> (ø)
8.1	80.43% <ø> (ø)

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