ci: allow less executors to fail

[quantum5]

Groovy is expected to be permanently fixed with the removal of Java security managers, and GASARM works now on arm64.

[codecov-commenter]

Codecov Report

Merging #953 (f15bc44) into master (9704d41) will decrease coverage by 0.99%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #953      +/-   ##
==========================================
- Coverage   86.54%   85.55%   -1.00%     
==========================================
  Files         138      138              
  Lines        4736     4667      -69     
==========================================
- Hits         4099     3993     -106     
- Misses        637      674      +37     

Impacted Files	Coverage Δ
dmoj/utils/os_ext.py	85.00% <0.00%> (-10.00%)	⬇️
dmoj/utils/communicate.py	88.15% <0.00%> (-5.27%)	⬇️
dmoj/cptbox/isolate.py	91.59% <0.00%> (-4.21%)	⬇️
dmoj/executors/base_executor.py	82.37% <0.00%> (-3.06%)	⬇️
dmoj/contrib/default.py	81.25% <0.00%> (-2.97%)	⬇️
dmoj/cptbox/tracer.py	82.35% <0.00%> (-2.74%)	⬇️
dmoj/executors/java_executor.py	82.65% <0.00%> (-2.71%)	⬇️
dmoj/monitor.py	32.95% <0.00%> (-2.22%)	⬇️
dmoj/executors/RUBY2.py	78.94% <0.00%> (-2.01%)	⬇️
dmoj/result.py	88.88% <0.00%> (-1.78%)	⬇️
... and 35 more

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