ENH replace @pf.register_groupby_method to @pf.register_series_groupby_me…

[gcamargo2]

…thod

PR Description

Please describe the changes proposed in the pull request:

This PR resolves #(put issue number here, and remove parentheses).

PR Checklist

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1. PR in from a fork off your branch. Do not PR from <your_username>:dev, but rather from <your_username>:<feature-branch_name>.

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3. Add a line to CHANGELOG.md under the latest version header (i.e. the one that is "on deck") describing the contribution.
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Relevant Reviewers

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• @ericmjl

[gcamargo2]

this was breaking the package once I upgrade it.

[ericmjl]

@gcamargo2 thanks for the PR. I notice it's duplicate with #1535. Not an issue here, I'm going to merge #1535 but acknowledge that both of you found the issue and made a PR. Thank you!

[gcamargo2]

thanks @ericmjl !

[ericmjl]

@gcamargo2 you've been tagged/acknowledged in a separate infra PR that I'm working on, #1540! Going to close out this PR.