Improve Shopify Private Key Detection

[patcain-34]

Description

Improve detection regex for Shopify Private Keys

Preferred Solution

Update existing regex to also match:

shpss_[a-fA-F0-9]{32}

Additional Context

Shopify Private Keys can have the format shpss_ followed by 32 hexadecimal characters. The current detector may not capture this format. Improving this will enhance TruffleHog's coverage for Shopify credential detection.

References

None currently.