Rule S2068: change rule type to Security Hotspot

The rule type changed to Security Hotspot.
Therefore, the issue message has change to:
"xxxxx" detected here, make sure this is not a hard-coded credential. ("xxxxx" being the matched wordlist item)

let variableNameWithPasswordInIt = "xxx" // Noncompliant {{"password" detected here, make sure this is not a hard-coded credential.}}