Change @security-severity for log injection queries from 7.8 to 6.1

Author: owen-mc

csharp/ql/src/Security Features/CWE-117/LogForging.ql

@@ -4,7 +4,7 @@
  *              insertion of forged log entries by a malicious user.
  * @kind path-problem
  * @problem.severity error
- * @security-severity 7.8
+ * @security-severity 6.1
  * @precision high
  * @id cs/log-forging
  * @tags security

go/ql/src/Security/CWE-117/LogInjection.ql

@@ -4,7 +4,7 @@
  *              insertion of forged log entries by a malicious user.
  * @kind path-problem
  * @problem.severity error
- * @security-severity 7.8
+ * @security-severity 6.1
  * @precision medium
  * @id go/log-injection
  * @tags security

java/ql/src/Security/CWE/CWE-117/LogInjection.ql

@@ -4,7 +4,7 @@
  *              insertion of forged log entries by malicious users.
  * @kind path-problem
  * @problem.severity error
- * @security-severity 7.8
+ * @security-severity 6.1
  * @precision medium
  * @id java/log-injection
  * @tags security

python/ql/src/Security/CWE-117/LogInjection.ql

@@ -4,7 +4,7 @@
  *              insertion of forged log entries by a malicious user.
  * @kind path-problem
  * @problem.severity error
- * @security-severity 7.8
+ * @security-severity 6.1
  * @precision medium
  * @id py/log-injection
  * @tags security

ruby/ql/src/queries/security/cwe-117/LogInjection.ql

@@ -4,7 +4,7 @@
  *              insertion of forged log entries by a malicious user.
  * @kind path-problem
  * @problem.severity error
- * @security-severity 7.8
+ * @security-severity 6.1
  * @precision medium
  * @id rb/log-injection
  * @tags security