Bump absl and gRPC dependencies

[ChrisCummins]

Fixes building on macOS.

[codecov-commenter]

Codecov Report

Merging #664 (8bf9a74) into development (66bea84) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development     #664      +/-   ##
===============================================
- Coverage        88.38%   88.24%   -0.14%     
===============================================
  Files              119      119              
  Lines             7497     7497              
===============================================
- Hits              6626     6616      -10     
- Misses             871      881      +10     

Impacted Files	Coverage Δ
compiler_gym/views/observation_space_spec.py	82.85% <0.00%> (-2.86%)	⬇️
...loop_tool/service/loop_tool_compilation_session.py	88.43% <0.00%> (-2.73%)	⬇️
compiler_gym/views/observation.py	97.29% <0.00%> (-2.71%)	⬇️
...ompiler_gym/service/client_service_compiler_env.py	90.35% <0.00%> (-0.84%)	⬇️

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