update Asana PAT detector to match new token format

[slashnick]

Description:

Asana updated their Personal Access Token format to include an extra ID before the secret part.

Newly issued Asana PATs look something like 2/1234567890123456/1234567890123457:abcdef0123456789abcdef0123456789

Checklist:

• [x] Tests passing (make test-community)?
• [x] Lint passing (make lint this requires golangci-lint)?

[CLAassistant]

All committers have signed the CLA.