chore(http): remove obsolete const lint allow (#26127)

Author: arfa79

src/http.rs

@@ -754,11 +754,9 @@ impl ParameterValue {
     }
 
     /// Returns the raw string value of the parameter.
-    #[allow(clippy::missing_const_for_fn)]
-    pub fn value(&self) -> &str {
+    pub const fn value(&self) -> &str {
         match self {
-            ParameterValue::String(s) => s,
-            ParameterValue::Typed { value, .. } => value,
+            ParameterValue::String(value) | ParameterValue::Typed { value, .. } => value.as_str(),
         }
     }