Remove redundant copybutton requirement

[cmills1095]

Removed the redundant copybutton requirement in requirements.txt

[MFraters]

Thanks!

[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	1.092 ± 0.030 (s=436)	1.090 ± 0.025 (s=391)	-0.8% .. +0.3%
Slab interpolation curved simple none	1.480 ± 0.017 (s=304)	1.480 ± 0.018 (s=307)	-0.3% .. +0.3%
Spherical slab interpolation simple none	1.596 ± 0.057 (s=291)	1.597 ± 0.062 (s=275)	-1.0% .. +1.1%
Slab interpolation simple curved CMS	2.231 ± 0.022 (s=209)	2.233 ± 0.026 (s=197)	-0.3% .. +0.4%
Spherical slab interpolation simple CMS	2.322 ± 0.069 (s=195)	2.332 ± 0.074 (s=194)	-0.6% .. +1.5%
Spherical fault interpolation simple none	1.792 ± 0.018 (s=247)	1.792 ± 0.018 (s=258)	-0.3% .. +0.3%

[codecov]

Codecov Report

Merging #395 (b4a08b9) into main (56e20c6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #395   +/-   ##
=======================================
  Coverage   99.00%   99.00%           
=======================================
  Files          79       79           
  Lines        4711     4711           
=======================================
  Hits         4664     4664           
  Misses         47       47           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 56e20c6...b4a08b9. Read the comment docs.

[MFraters]

There was an issue with the github tester which I couldn't reset through the controls. Pushing another commit did fix the issue. The commit I pushed is unrelated to the pull request, but adds an extra page to the manual on the coupling of the GWB and ASPECT. I hope this was just a one-time glitch in the tester.