Suggestion: depend on gmp instead of mpir

[regro-cf-autotick-bot]

I noticed that this recipe depends on mpir instead of
gmp. The package 'mpir' is deprecated and unmaintained. Use 'gmp' instead.
This PR makes this change.
Notes and instructions for merging this PR:

1. Make sure that the recipe can indeed only depend on gmp.
2. Please merge the PR only after the tests have passed.
3. Feel free to push to the bot's branch to update this PR if needed.

If this PR was opened in error or needs to be updated please add the bot-rerun label to this PR. The bot will close this PR and schedule another one. If you do not have permissions to add this label, you can use the phrase @conda-forge-admin, please rerun bot in a PR comment to have the conda-forge-admin add it for you.

_{This PR was created by the regro-cf-autotick-bot. The regro-cf-autotick-bot is a service to automatically track the dependency graph, migrate packages, and propose package version updates for conda-forge. Feel free to drop us a line if there are any issues! This PR was generated by https://github.com/regro/cf-scripts/actions/runs/11090842242 - please use this URL for debugging.}

[github-actions]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

[github-actions]

Hi! This is the friendly conda-forge automerge bot!

I considered the following status checks when analyzing this PR:

• linter: passed
• azure: failed

Thus the PR was not passing and not merged.

[danielnachun]

@conda-forge-admin please rerender

[github-actions]

Hi! This is the friendly conda-forge automerge bot!

Commits were made to this PR after the automerge label was added. For security reasons, I have disabled automerge by removing the automerge label. Please add the automerge label again (or ask a maintainer to do so) if you'd like to enable automerge again!

[danielnachun]

So that they are not lost in future cleanups, here are the current test failures:

The following tests FAILED:
	  8 - test_functions (Failed)
	 32 - test_ntheory (Failed)
	 48 - test_eval_mpfr (Failed)
	 51 - test_evalf (Failed)