Change @security-severity for XSS queries from 6.1 to 7.8

java/ql/src/Security/CWE/CWE-079/AndroidWebViewAddJavascriptInterface.ql

@@ -4,7 +4,7 @@
  * @description Exposing a Java object in a WebView with a JavaScript interface can lead to malicious JavaScript controlling the application.
  * @kind problem
  * @problem.severity warning
- * @security-severity 6.1
+ * @security-severity 7.8
  * @precision medium
  * @tags security
  *       external/cwe/cwe-079

java/ql/src/Security/CWE/CWE-079/AndroidWebViewSettingsEnabledJavaScript.ql

@@ -4,7 +4,7 @@
  * @kind problem
  * @id java/android/websettings-javascript-enabled
  * @problem.severity warning
- * @security-severity 6.1
+ * @security-severity 7.8
  * @precision medium
  * @tags security
  *       external/cwe/cwe-079

java/ql/src/Security/CWE/CWE-079/XSS.ql

@@ -4,7 +4,7 @@
  *              allows for a cross-site scripting vulnerability.
  * @kind path-problem
  * @problem.severity error
- * @security-severity 6.1
+ * @security-severity 7.8
  * @precision high
  * @id java/xss
  * @tags security