Add case insensitivity to tentative secret finder

[domwhewell-sage]

BCheck Contributions

• BCheck compiles and executes as expected
• BCheck contains appropriate metadata (name, version, author, description and appropriate tags)
• Only .bcheck files have been added or modified
• BCheck is in the appropriate folder
• PR contains single or limited number of BChecks (Multiple PRs are preferred)
• BCheck attempts to minimize false positives

Description

Modified the "Information Disclosure Secret Finder - tentative" bcheck file as key matchers (Those that match the key rather than the value) only matched the lowercase versions of the naming conventions if the javascript contained an uppercase name or camel case version of the key it would not match

Example

Old

• api[_-]?key[_-]?sid(=| =|:| :) only matched api_key= etc.

New

• (?i)api[_-]?key[_-]?sid(=| =|:| :) matches api_key= and API_KEY= etc.

[PortSwiggerWiener]

Many thanks for your submission.

LGTM 👍