## What kind of change does this PR introduce?
* Currently, when the "Unacceptable audience in id_token" error is
returned, it doesn't log the audience claim from the id token, which
makes it hard to debug. The audience claim from the id token is now
logged as well when this error is returned.
* Adds a basic test for the generic id token oidc `getProvider()`
method, since we currently have 0 coverage for this file
* The test also uncovered a possible nil pointer panic in the case of
the generic OIDC provider being returned since in the generic case, the
`oauthConfig` will be nil. Rather than returning the `oauthConfig`, we
only need to return the `skipNonceCheck` property since we only check
for that.

## What kind of change does this PR introduce?
This makes the emails to be explicitly set to be HTML formatted instead
of plain text which helper older clients that cannot figure this out
themselves.

## What is the current behavior?

Email messages are sent as plain/text. 

## What is the new behavior?

Feel free to include screenshots if it includes visual changes.

## Additional context

Add any other context or screenshots.

## What kind of change does this PR introduce?
* Bump alpine version to v3.20.0 to resolve an openssl vuln
* Bump go to v1.22