fix: increase min CMake to 3.5

[henryiii]

CMake 3.27 will start warning if this is older than 3.5.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (dce7983) 99.46% compared to head (0b7ab0d) 99.46%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #898   +/-   ##
=======================================
  Coverage   99.46%   99.46%           
=======================================
  Files          18       18           
  Lines        4095     4095           
=======================================
  Hits         4073     4073           
  Misses         22       22           

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[phlptp]

I think 3.5 keep this running on a default Ubuntu 18.04 and RHEL 6 so should be good

[henryiii]

Checking https://cliutils.gitlab.io/modern-cmake/chapters/intro/installing.html, 18.04 used 3.10. 16.04 used 3.5. Though both are EoL, both should be fine. :)

RHEL 6 is weird, as "cmake" continued to point at 2.8, as if 3 was a breaking change (it wasn't). Guessing this is referring to EPEL 6, which is .

[phlptp]

If I remember right RHEL 6 had a cmake3 package that had cmake 3.6, and it was a bit weird but at least it was available as a package. Been a while since I used that version though.