Update `hashbrown` dep
@@ -50,7 +50,8 @@ static_assertions = "1.1.0"
lazy_static = { version = "1.4.0", optional = true }
# if: no_std and serde
-hashbrown = { version = "0.11.2", optional = true }
+# hashbrown 0.12.0 requires Rust 1.56.1 but our MSRV is 1.54.0+
+hashbrown = { version = ">=0.11.2, <0.13.0", optional = true }
# If: serde
[dependencies.serde]
