v2.1.2: [SEC-6431] bumped gosec action version (#8)

This should pick up the [go version
detection](https://github.com/securego/gosec?tab=readme-ov-file#go-version)
to avoid the version mismatch issue described
[here](https://launchdarkly.atlassian.net/browse/SEC-6431?focusedCommentId=306318).