Fixed oer C code generation with sequences in additions (#168)

[Futsch1]

Further fixes:

• Restricted Python package versions to make sure tests pass
• Fixes in C test code for warnings generated by clang 15
• Enabled uper C code compilation and fixed some casting issues there

[codecov]

Codecov Report

Merging #169 (ff00593) into master (de25657) will decrease coverage by 0.36%.
The diff coverage is 23.35%.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
- Coverage   35.18%   34.82%   -0.36%     
==========================================
  Files           7        7              
  Lines        8567     8666      +99     
==========================================
+ Hits         3014     3018       +4     
- Misses       5553     5648      +95     

Files	Coverage Δ
tests/test_oer.c	100.00% <100.00%> (ø)
tests/test_uper.c	100.00% <100.00%> (ø)
tests/files/c_source/uper.c	22.56% <47.54%> (-0.13%)	⬇️
tests/files/c_source/oer.c	29.55% <0.00%> (-0.55%)	⬇️

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[coveralls]

coverage: 96.473% (+0.002%) from 96.471% when pulling ff00593 on Futsch1:168-oer-c-code-generation-fails-when-addition-contains-a-sequence-with-enums-type-error into de25657 on eerimoq:master.