[util] Increase persistence on "Too many Requests" errors.

[ChrisCummins]

No description provided.

[codecov-commenter]

Codecov Report

Merging #435 (0d9e1d3) into development (8c66b24) will decrease coverage by 0.11%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development     #435      +/-   ##
===============================================
- Coverage        87.42%   87.31%   -0.12%     
===============================================
  Files              104      104              
  Lines             5966     5966              
===============================================
- Hits              5216     5209       -7     
- Misses             750      757       +7     

Impacted Files	Coverage Δ
compiler_gym/util/download.py	93.93% <100.00%> (ø)
compiler_gym/service/connection.py	76.55% <0.00%> (-2.07%)	⬇️
...loop_tool/service/loop_tool_compilation_session.py	89.58% <0.00%> (-0.70%)	⬇️

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