Fix default values of .mean for pandas version >= 2

[catchSheep]

PR for issue https://github.com/datacarpentry/python-ecology-lesson/issues/564

Pandas version >= 2 changes the default argument of .mean to numeric_only = False from numeric_only=True This PR just inserts numeric_only=True into the relevant three lines

[github-actions[bot]]

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Rendered Changes

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The following changes were observed in the rendered markdown documents:

 02-starting-with-data.md | 6 +++---
 md5sum.txt               | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

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:stopwatch: Updated at 2023-05-29 12:25:58 +0000