ci: fix R <4.2 compatibility and test more R versions #105
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This resolves the R <4.2 CI failures encountered by gh-104. It also add jobs for R 4.2 and 4.3.
To resolve the CI failures, I originally wanted to do a more targeted pin of ggstats. But, as mentioned in the commit message, there are several other failures to deal with, so I ended up going with the blunter approach of using a date-pinned RSPM.