[deps] Roll d8 to bring faster JS string equality implementation for wasm

Change-Id: I3bc115072f3cdbd844579e40c8bcd89076acd35c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/410040
Commit-Queue: Martin Kustermann <[email protected]>
Reviewed-by: Slava Egorov <[email protected]>

Author: mkustermann

DEPS

@@ -71,7 +71,7 @@ vars = {
   # self-service update these by following the go/dart-engprod/browsers.md
   # instructions. d8, the V8 shell, is always checked out.
   "checkout_javascript_engines": False,
-  "d8_tag": "version:13.5.7",
+  "d8_tag": "version:13.5.86",
   "jsshell_tag": "version:135.0",
   "jsc_tag": "version:290198",