Re-document using roxygen2 7.3.3 and depend on R >= 3.4

Author: shikokuchuo

DESCRIPTION

@@ -22,6 +22,8 @@ Description: Executes arbitrary R or C functions some time after the
 License: MIT + file LICENSE
 URL: https://later.r-lib.org, https://github.com/r-lib/later
 BugReports: https://github.com/r-lib/later/issues
+Depends:
+    R (>= 3.4)
 Imports:
     Rcpp (>= 0.12.9),
     rlang
@@ -39,4 +41,4 @@ Config/testthat/edition: 3
 Config/usethis/last-upkeep: 2025-07-18
 Encoding: UTF-8
 Roxygen: list(markdown = TRUE)
-RoxygenNote: 7.3.2
+RoxygenNote: 7.3.3