Update Cadical to version 2.1.0

[Dekker1]

This includes several changes to the IPASIR-UP interface

[codecov]

Codecov Report

Attention: Patch coverage is 51.76471% with 41 lines in your changes missing coverage. Please review.

Project coverage is 75.50%. Comparing base (e9a239a) to head (90631db).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
crates/pindakaas/src/solver/libloading.rs	32.35%	23 Missing ⚠️
crates/pindakaas/src/solver.rs	22.22%	14 Missing ⚠️
crates/pindakaas-build-macros/src/lib.rs	60.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #74      +/-   ##
===========================================
- Coverage    75.61%   75.50%   -0.12%     
===========================================
  Files           31       31              
  Lines         7439     7486      +47     
  Branches      7439     7486      +47     
===========================================
+ Hits          5625     5652      +27     
- Misses        1691     1711      +20     
  Partials       123      123              

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