Revert CI env change so geotiepoints comes from conda-forge

[djhoese]

Forgot that I made this change in #2835 because I needed to wait for the new python-geotiepoints to be available on conda-forge.

• Closes #xxxx
• Tests added
• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.94%. Comparing base (9339a7f) to head (834f45d).
Report is 336 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2841   +/-   ##
=======================================
  Coverage   95.94%   95.94%           
=======================================
  Files         366      366           
  Lines       53543    53561   +18     
=======================================
+ Hits        51371    51389   +18     
  Misses       2172     2172           

Flag	Coverage Δ
behaviourtests	4.04% <ø> (-0.01%)	⬇️
unittests	96.04% <ø> (+<0.01%)	⬆️

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[coveralls]

Pull Request Test Coverage Report for Build 9687447409

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.044%

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Totals
Change from base Build 9685663864:	0.0%
Covered Lines:	51618
Relevant Lines:	53744

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💛 - Coveralls