Log Message:
(math/R-googlesheets4) Updated 1.1.0 to 1.1.1

# googlesheets4 1.1.1

* `gs4_auth(subject =)` is a new argument that can be used with
  `gs4_auth(path =)`, i.e. when using a service account. The `path` and
  `subject` arguments are ultimately processed by
  `gargle::credentials_service_account()` and support the use of a service
  account to impersonate a normal user.

* `gs4_scopes()` is a new function to access scopes relevant to the Sheets and
  Drive APIs. When called without arguments, `gs4_scopes()` returns a named
  vector of scopes, where the names are the associated short aliases.
  `gs4_scopes()` can also be called with a character vector; any element that's
  recognized as a short alias is replaced with the associated full scope (#291).

* Various internal changes to sync up with gargle v1.5.0.