Merge pull request #1185 from stan-dev/roxygen-v8

Swap to roxygen2 v8.0.0

Author: jgabry

DESCRIPTION

@@ -34,7 +34,6 @@ URL: https://mc-stan.org/cmdstanr/, https://discourse.mc-stan.org
 BugReports: https://github.com/stan-dev/cmdstanr/issues
 Encoding: UTF-8
 LazyData: true
-RoxygenNote: 7.3.3
 Roxygen: list(markdown = TRUE, r6 = FALSE)
 SystemRequirements: CmdStan (https://mc-stan.org/users/interfaces/cmdstan)
 Depends:
@@ -60,3 +59,4 @@ Suggests:
     Rcpp
 VignetteBuilder: knitr
 Config/testthat/edition: 3
+Config/roxygen2/version: 8.0.0