Support Conan 1.29

[uilianries]

Changelog: Feature: Support Conan 1.29.x

• Refer to the issue that supports this Pull Request.
• If the issue has missing info, explain the purpose/use case/pain/need that covers this Pull Request.
• I've read the Contributing guide.
• I've followed the PEP8 style guides for Python code.

[codecov-commenter]

Codecov Report

Merging #522 into master will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #522      +/-   ##
==========================================
- Coverage   92.85%   92.83%   -0.03%     
==========================================
  Files          35       35              
  Lines        3641     3641              
==========================================
- Hits         3381     3380       -1     
- Misses        260      261       +1     

Impacted Files	Coverage Δ
cpt/__init__.py	100.00% <100.00%> (ø)
cpt/ci_manager.py	92.46% <0.00%> (-0.42%)	⬇️

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