fix: right fields on SARIF output

[itay-goldraich]

Close #147

Proposed Changes

• sarif.go file changed as the issue requested
• The fields ruleId, artifactLocation.uri got the others' values.
  -The field message.text changed to be {Rule Name} has detected secret for file {file path}

I submit this contribution under the Apache-2.0 license.

[baruchiro]

Can you give us an example of the new SARIF output (by running go run . filesystem --path . --report-path results.sarif)?

Good work!!