Start to remove stringsAsFactors references

[mikemahoney218]

If this pull request addresses an open issue on the repository, please add 'Closes #NN' below, where NN is the issue number.
This PR addresses #119 (it does not close it)

Please briefly summarise the changes made in the pull request, and the reason(s) for making these changes.
This PR does two main things:

1. Updates Episode 3 to remove references to stringsAsFactors, and to update examples and text to match modern R versions.
2. Updates Episode 4 to remove stringsAsFactors = FALSE where it no longer changes how the code works.

I also removed two stringsAsFactors calls from renv/activate.R which shouldn't change execution at all.

I left in the stringsAsFactors = TRUE seen in Episode 4, though I'm not confident it does anything, as well as the discussion of factors at the end of episode 4. I think there's probably a larger discussion to be had about if that section is serving our needs with R 4.3+, but I want to check and see if factors are used later in this workshop before I propose cutting it out.

If any relevant discussions have taken place elsewhere, please provide links to these.

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[github-actions]

Thank you!

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🔍 Inspect the changes: https://github.com/datacarpentry/r-intro-geospatial/compare/md-outputs..md-outputs-PR-145

The following changes were observed in the rendered markdown documents:

 03-data-structures-part1.md | 112 ++++++++++++++++++++++++++++++--------------
 04-data-structures-part2.md |   8 ++--
 md5sum.txt                  |   4 +-
 3 files changed, 83 insertions(+), 41 deletions(-)

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⏱️ Updated at 2023-09-20 19:15:27 +0000

[likeajumprope]

This sounds plausible to me. If @albhasan agrees I think we could merge this.

[likeajumprope]

Sound plausible to me.

[albhasan]

This sounds plausible to me. If @albhasan agrees I think we could merge this.

I agree!