bump hashbrown, fix warnings

Cargo.toml

@@ -22,7 +22,7 @@ members = ['test-suite']
 [dependencies]
 serde = { version = "1.0.97", default-features = false, features = ["alloc"] }
 indexmap = { version = "1.0", optional = true }
-hashbrown = { version = "0.7.2" }
+hashbrown = { version = "0.12.3" }
 
 [dev-dependencies]
 serde_derive = "1.0"

test-suite/tests/parser.rs

@@ -298,6 +298,7 @@ fn floats() {
 }
 
 #[test]
+#[allow(unused_must_use)]
 fn bare_key_names() {
     let a = "
         foo = 3
@@ -412,6 +413,7 @@ fn bad_table_names() {
 }
 
 #[test]
+#[allow(unused_must_use)]
 fn table_names() {
     let a = "
         [a.\"b\"]