refactor: Remove redundant check in cookie character validation

Author: leekib

aws-serverless-java-container-core/src/main/java/com/amazonaws/serverless/proxy/internal/servlet/AwsCookieProcessor.java

@@ -262,6 +262,6 @@ private boolean isToken(String s) {
     }
 
     private boolean isValidCookieChar(char c) {
-        return !(c < 0x21 || c > 0x7E ||  c == 0x22 || c == 0x2c || c == 0x3b || c == 0x5c || c == 0x7f);
+        return !(c < 0x21 || c > 0x7E ||  c == 0x22 || c == 0x2c || c == 0x3b || c == 0x5c);
     }
 }