Remove default feature override from wasmtime Cargo.toml

Signed-off-by: Matt Leon <mattleon@google.com>

Author: leonm1

bazel/cargo/wasmtime/Cargo.toml

@@ -24,4 +24,4 @@ path = "fake_lib.rs"
 [dependencies]
 # Fixes testdata build error due to missing crate_features = ["std"]
 log = {version = "0.4.29", default-features = false, features = ['std']}
-wasmtime-c-api-impl = {version = "24.0.0", default-features = false, features = ['cranelift']}
+wasmtime-c-api-impl = {version = "=24.0.0", features = ['cranelift']}