[ci] Roll pinned Kani version (#1611)

Co-authored-by: Joshua Liebow-Feeser <joshlf@users.noreply.github.com>

.github/workflows/ci.yml

@@ -520,7 +520,7 @@ jobs:
           args: "--package zerocopy --features __internal_use_only_features_that_work_on_stable --output-format=terse --randomize-layout --memory-safety-checks --overflow-checks --undefined-function-checks --unwinding-checks"
           # This version is automatically rolled by
           # `roll-pinned-toolchain-versions.yml`.
-          kani-version: 0.54.0
+          kani-version: 0.55.0
 
   check_fmt:
     runs-on: ubuntu-latest