added changes for github and slack token

[gr8nishan]

Added a new pii for Github Fine Grained Token
"""\b((?:github_pat)[a-zA-Z0-9]{36,255})\b"""

Adding github_pat as mentioned here and based on test data we created.

Slack
Changed from - """(xoxb|xoxp|xapp|xoxa|xoxr)-[0-9]{10,13}-[a-zA-Z0-9-]"""
To - """(xoxb|xoxp|xapp|xoxa|xoxr|xoxo|xoxs|xoxe)-[0-9]{10,13}-[a-zA-Z0-9-]"""

Adding as mentioned here

Google API
Changed from - """(?i)(?:youtube)(?:.|[\n\r]){0,40}\bAIza[0-9A-Za-z-]{35}\b"""
To - """\bAIza[0-9A-Za-z-]{35}\b
Changing as mentioned here

Reducing confidence score from 0.8 to 0.4 for
Github token
Github Finegrained Token
Google API Key

This is done to support format like

"Git":"value"
"Pat":"value"
Git:value
Key:value
key-value

Check images
With Confidence = 0.8

With Confidence = 0.4

[Raj725]

LGTM if false positives are acceptable

[Raj725]

False Positives: In addition to matching existing token patterns, the new github-token regex will also match new patterns that include underscores, which could lead to false positives.

For example, it might incorrectly match strings like ghp_1234567890abcdef1234567890abcdef1234_extra or ghp_12345_67890_abcdef_12345_67890_abcdef, which may not be valid tokens.