Need to Update Regex Patterns in Threat Protectors

[TomasWso2]

Description:
The patterns given in https://apim.docs.wso2.com/en/3.2.0/learn/api-gateway/threat-protectors/regular-expression-threat-protection-for-api-gateway/#blacklisting-patterns are not correct for JavaScript Injection.

For the JavaScript Injection '<\sscript\b[^&gt;]>[^&lt;]+<\s*/\sscript\s>' should be used.

Same as shown in https://apim.docs.wso2.com/en/4.1.0/deploy-and-publish/deploy-on-gateway/api-gateway/threat-protectors/regular-expression-threat-protection-for-api-gateway/

Affected Product Version:
APIM 3.2.0

Related Issues:
#7722
wso2/api-manager#2549