Avoid String allocations in MediaType.checkParameters

Closes gh-29428

Author: dreis2211

spring-web/src/main/java/org/springframework/http/MediaType.java

@@ -531,10 +531,10 @@ public MediaType(MimeType mimeType) {
 	protected void checkParameters(String parameter, String value) {
 		super.checkParameters(parameter, value);
 		if (PARAM_QUALITY_FACTOR.equals(parameter)) {
-			value = unquote(value);
-			double d = Double.parseDouble(value);
+			String unquotedValue = unquote(value);
+			double d = Double.parseDouble(unquotedValue);
 			Assert.isTrue(d >= 0D && d <= 1D,
-					"Invalid quality value \"" + value + "\": should be between 0.0 and 1.0");
+					() -> "Invalid quality value \"" + value + "\": should be between 0.0 and 1.0");
 		}
 	}