[deps] rev http

http (https://github.com/dart-lang/http/compare/805a147..74f9d3d):
  74f9d3d  2023-03-09  Brian Quinlan  Add conformances test that verify that the Client works in Isolates (#889)
  ee03604  2023-03-09  Brian Quinlan  Add a flag to allow the default Client to be tree shaken away. (#868)
  2039fb3  2023-03-09  Brian Quinlan  Fix a reference count race with forwarded delegates. (#888)

Change-Id: I56faf5cf41ad16f6a365db66265b02e66adbc59f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/289502
Commit-Queue: Devon Carew <devoncarew@google.com>
Reviewed-by: Devon Carew <devoncarew@google.com>
Auto-Submit: Ivan Inozemtsev <iinozemtsev@google.com>

Author: iinozemtsev

DEPS

@@ -140,7 +140,7 @@ vars = {
   "fixnum_rev": "f8379d94436f3a73f71ea078f3207897c6700498",
   "glob_rev": "f378dc8734f9f2413e93951f95d278420e4a03e0",
   "html_rev": "08643e9e2baac0f20ce4a3b8baed820107972270",
-  "http_rev": "805a14742e293fb51c0b89004b51add50d825792",
+  "http_rev": "74f9d3df83545f83338794d1decc28d10a94d290",
   "http_multi_server_rev": "7bd190c70288361ed01ad31668e93544bcc5cf2b",
   "http_parser_rev": "b3b283b9f139640b932d604e8815460bbd3ecab5",
   "intl_rev": "fca552f2ec5d682b5fa36f02bdd72a5a4e2edcee",