ci: Update cargo clippy to 1.91 (#1435)

Author: caspermeijn

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ permissions:
 
 env:
   PROTOC_VERSION: "3.25.3"
-  clippy_rust_version: "1.89"
+  clippy_rust_version: "1.91"
 
 jobs:
   # Depends on all actions that are required for a "successful" CI run.

prost-types/Cargo.toml

@@ -29,5 +29,7 @@ proptest = "1"
 unexpected_cfgs = { level = "warn", check-cfg = ['cfg(kani)'] }
 
 [lints.clippy]
+# This lint has MSRV 1.87
+manual_is_multiple_of = "allow"
 # This lint has MSRV 1.88
 collapsible_if = "allow"