Use a newer version of R for pkgdown #2581

Job	Run time
Render README	0s
Validation	0s
Documentation	0s
Code Style / Get R version	2s
Check / (4.1)	1m 26s
Lint / Get R version	1s
Check / (4.2)	1m 34s
Check / (4.3)	1m 25s
Code Coverage / Get R version	1s
Spelling / Get R version	2s
Links / Validate Links	8s
Man Pages / Get R version	2s
Code Style / Code Style	1m 14s
Lint / Lint	1m 23s
Man Pages / Roxygen	1m 13s
Code Coverage / Test Coverage	1m 40s
Spelling / Spellcheck	1m 30s
Code Coverage / Generate badge for coverage	0s
	11m 41s

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