fix: reduce false positives by hashicorp

[baruchiro]

Description:

To add this rule I took examples from the official Hashicorp documentation, but now I used this rule and it find too generic cases such as const TagPassword = "password".

Using the Entropy field is a balance between true/false positives, since with 3.5 it will ignore almost all passwords less then 10 characters length.

Checklist:

• Does your PR pass tests?
• Have you written new tests for your changes?
• Have you lint your code locally prior to submission?

Original: gitleaks#1358