Bump test to 8bbb8474e3ff85aa9450c2b00f9476b34ebdd679

Changes:
```
> git log --format="%C(auto) %h %s" d0d5ccd..8bbb847
 https://dart.googlesource.com/test.git/+/8bbb8474 Example of how to use `has` (2631)
 https://dart.googlesource.com/test.git/+/bd401482 Remove extra version info (2539)
 https://dart.googlesource.com/test.git/+/d20671c1 Fix dart2wasm tests with custom HTML files (2626)
 https://dart.googlesource.com/test.git/+/17efdc2f fix: improve error reporting on GitHub (2629)
 https://dart.googlesource.com/test.git/+/c21233e9 Ignore test pid on windows (2630)
 https://dart.googlesource.com/test.git/+/e8012f71 Bump to language version 3.10 (2624)
 https://dart.googlesource.com/test.git/+/cfdd7d26 Bump the github-actions group with 3 updates (2619)

```

Diff: https://dart.googlesource.com/test.git/+/d0d5ccd037cb0eaea8e4dad900946ac54a4286c6..8bbb8474e3ff85aa9450c2b00f9476b34ebdd679/
Change-Id: Iac7bb756cb4028a70fa448462e83f0c145ffaef7
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/498681
Reviewed-by: Kevin Moore <kevmoo@google.com>
Commit-Queue: Kevin Moore <kevmoo@google.com>
Auto-Submit: Nate Bosch <nbosch@google.com>

DEPS

@@ -149,7 +149,7 @@ vars = {
   "shelf_rev": "c4b94d3879e627c0b1fe95d9e1ce5f93ebf122d3",
   "sync_http_rev": "6666fff944221891182e1f80bf56569338164d72",
   "tar_rev": "13479f7c2a18f499e840ad470cfcca8c579f6909",
-  "test_rev": "d0d5ccd037cb0eaea8e4dad900946ac54a4286c6",
+  "test_rev": "8bbb8474e3ff85aa9450c2b00f9476b34ebdd679",
   "tools_rev": "eaeb52bcd3004be92b105e90bcf8e4ada01dd659",
   "vector_math_rev": "7bf60fb95e0fbbd7648944071de9ab5e32ce7387",
   "web_rev": "15599ee684a2d4c1f974eba70013d80103a80cec",