chore: update golang auth dependancies

[AlaricWhitney]

• Identified the issue which this PR solves.
• Read the CONTRIBUTING document.
• Code builds clean without any errors or warnings.
• Added appropriate tests for any new functionality.
• All new and existing tests passed.
• Added comments in the code, where necessary.
• Ran make check to catch common errors. Fixed any that came up.

Description:
Updated all golang dependancies to the latest versions

Out of Scope:
Changing any code logic or evaluating which libraries are no longer needed.

[mastercactapus]

Can you give some context on what changed with OIDC, github, and jose major version updates?

Since those are used for auth, and oidc+github will require manual validation locally, it would be helpful to know what changed with them.

[AlaricWhitney]

Can you give some context on what changed with OIDC, github, and jose major version updates?

Since those are used for auth, and oidc+github will require manual validation locally, it would be helpful to know what changed with them.

• https://github.com/coreos/go-oidc#updates-from-v2-to-v3: TLDR, NewRemoteKeySet() changed, but I did a search and goalert doesn't use it.
• https://github.com/google/go-github#version-compatibility-table: TLDR, it's fully compatible with the latest github v3 API.
• jose (I didn't update it, it was auto updated as per go mod tidy as a transitive dependency.

[AlaricWhitney]

fixed merge conflicts. ready for review again.