[co19] Roll co19 to 85c868a325bc92f4e743958077ad0ad2eb58c81f

2023-11-23 [email protected] Merge pull request dart-lang/co19#2395 from dart-lang/merge-pre-nnbd
2023-11-23 [email protected] Fixes dart-lang/co19#2390. Fix tests according to the new method/setter rules (dart-lang/co19#2392)
2023-11-23 [email protected] Fixes dart-lang/co19#2388. Add tests for the new method/setter rules. Update assertions (dart-lang/co19#2393)
2023-11-23 [email protected] Merge remote-tracking branch 'origin/pre-nnbd' into master
2023-11-22 [email protected] Fixes dart-lang/co19#2389. Add additional error expectation for analyzer (dart-lang/co19#2391)
2023-11-21 [email protected] dart-lang/co19#2342. Update nullability tests according to the new rules (dart-lang/co19#2385)
2023-11-21 [email protected] Fixes dart-lang/co19#2384. Fix not well-bound extension types. Add function-type dynamic test (dart-lang/co19#2387)

Change-Id: Ic3848f6f39fd42b01bfed5feac3d922c6f5a53d5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/338120
Reviewed-by: Erik Ernst <[email protected]>
Reviewed-by: Alexander Thomas <[email protected]>

DEPS

@@ -55,7 +55,7 @@ vars = {
 
   # co19 is a cipd package automatically generated for each co19 commit.
   # Use tests/co19/update.sh to update this hash.
-  "co19_rev": "460758bf4c298812d47b24f7e5040c75088c3ebf",
+  "co19_rev": "85c868a325bc92f4e743958077ad0ad2eb58c81f",
 
   # The internal benchmarks to use. See go/dart-benchmarks-internal
   "benchmarks_internal_rev": "f048a4a853e3062056d39c3db100acdde42f16d6",