Update Rust crate schemars to v0.8.21 (#3849)

Cargo.lock

@@ -3446,9 +3446,9 @@ dependencies = [
 
 [[package]]
 name = "schemars"
-version = "0.8.20"
+version = "0.8.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0218ceea14babe24a4a5836f86ade86c1effbc198164e619194cb5069187e29"
+checksum = "09c024468a378b7e36765cd36702b7a90cc3cba11654f6685c8f233408e89e92"
 dependencies = [
  "dyn-clone",
  "schemars_derive",
@@ -3459,9 +3459,9 @@ dependencies = [
 
 [[package]]
 name = "schemars_derive"
-version = "0.8.20"
+version = "0.8.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ed5a1ccce8ff962e31a165d41f6e2a2dd1245099dc4d594f5574a86cd90f4d3"
+checksum = "b1eee588578aff73f856ab961cd2f79e36bc45d7ded33a7562adba4667aecc0e"
 dependencies = [
  "proc-macro2",
  "quote",