Switch to gargle::request_retry()

Relates to #380.

This is only "relates" and not "closes" because #380 shows that many retry-able errors with Drive will be a 403 (with specific `reasons`), which are not among the retry-able code currently built-in to `gargle::request_retry()`.

But at least we'll retry for 429 now.

NEWS.md

@@ -1,5 +1,7 @@
 # googledrive (development version)
 
+* All requests now route through `gargle::request_retry()` (#380).
+
 * `drive_scopes()` is a new function to access scopes used with the Drive API.
   When called without arguments, `drive_scopes()` returns a named vector scopes,
   where the names are the associated short aliases.  `drive_scopes()` can also

R/request_make.R

@@ -30,7 +30,7 @@
 #' @export
 #' @family low-level API functions
 request_make <- function(x, ...) {
-  gargle::request_make(x, ..., user_agent = drive_ua())
+  gargle::request_retry(x, ..., user_agent = drive_ua())
 }
 
 #' @rdname request_make