build(deps): update parking_lot requirement from ^0.11 to ^0.12 (tikv…

…#434)

Signed-off-by: Jan Berktold <jberktold@roblox.com>

Cargo.toml

@@ -29,7 +29,7 @@ cfg-if = "^1.0"
 fnv = "^1.0"
 lazy_static = "^1.4"
 libc = { version = "^0.2", optional = true }
-parking_lot = "^0.11"
+parking_lot = "^0.12"
 protobuf = { version = "^2.0", optional = true }
 memchr = "^2.3"
 reqwest = { version = "^0.11", features = ["blocking"], optional = true }