fix(deps): Keep schemars at 0.8 for typify 0.6 compatibility

schemars 1.x removed `schema::RootSchema` and made the `schema` module
private, breaking `tools/gen-types/src/main.rs` which uses both
`RootSchema` and `Schema`. typify 0.6 still requires schemars 0.8, so we
cannot upgrade the schemars dependency in gen-types until typify ships a
release compatible with schemars 1.x.

Keeps the serde_json 1.0.149 → 1.0.150 bump from this PR.

Co-authored-by: Eden Reich <edenreich@users.noreply.github.com>

Author: claude[bot]

Cargo.lock

@@ -8,7 +8,7 @@ description = "Internal codegen binary: turns openapi.yaml schemas into src/gene
 [dependencies]
 anyhow = "1"
 prettyplease = "0.2"
-schemars = "1.2"
+schemars = "0.8"
 serde_json = "1"
 serde_yaml = "0.9"
 syn = { version = "2", features = ["full"] }