v7.15.0

## Release Highlights

- 🔒 OIDC JWT signing algorithms can now be configured
- 🍪 CSRF cookie improvements (SameSite option, proper expiration validation)
- 🧪 Configuration validation flag: --config-test
- 🔌 Unix socket file mode support
- 👤 Session state can now be extend with arbitrary claims from ID Token and upstream IDP user profiles endpoint
    - This opens the door for multiple features like:
    - Additional arbitrary header values for any claims your IDP provides
    - Extended OAuth2 Proxy UserInfo endpoint with all additional claims
    - Read the docs [here](https://oauth2-proxy.github.io/oauth2-proxy/configuration/alpha-config#how-to-utilize-arbitrary-claims-provided-by-your-identity-provider)

## Important Notes

CSRF cookie validation now correctly uses `CSRFExpire` instead of `Expire`. If you relied on the previous behavior, review your session timeout configuration.
Check the [documentation(https://oauth2-proxy.github.io/oauth2-proxy/configuration/overview#cookie-options) for `cookie-csrf-expire`.

## Breaking Changes

## Changes since v7.14.3

- [#3352](https://github.com/oauth2-proxy/oauth2-proxy/pull/3352) fix: backend logout URL call on sign out (#3172)(@vsejpal)
- [#3332](https://github.com/oauth2-proxy/oauth2-proxy/pull/3332) ci: distribute windows binary with .exe extension (@igitur)
- [#2685](https://github.com/oauth2-proxy/oauth2-proxy/pull/2685) feat: allow arbitrary claims from the IDToken and IdentityProvider UserInfo endpoint to be added to the session state (@vegetablest)
- [#3278](https://github.com/oauth2-proxy/oauth2-proxy/pull/3278) feat: possibility to inject id_token in redirect url during sign out (@albanf)
- [#2851](https://github.com/oauth2-proxy/oauth2-proxy/pull/2851) feat: add support for specifying allowed OIDC JWT signing algorithms (#2753) (@andoks / @tuunit)
- [#3369](https://github.com/oauth2-proxy/oauth2-proxy/pull/3369) fix: use CSRFExpire instead of Expire for CSRF cookie validation (@Br1an67)
- [#3365](https://github.com/oauth2-proxy/oauth2-proxy/pull/3365) fix: filter empty strings from allowed groups (@Br1an67)
- [#3338](https://github.com/oauth2-proxy/oauth2-proxy/pull/3338) feat: add --config-test flag for validating configuration (@MayorFaj)
- [#3347](https://github.com/oauth2-proxy/oauth2-proxy/pull/3347) feat: add same site option for csrf cookies (@jvnoije)
- [#3376](https://github.com/oauth2-proxy/oauth2-proxy/pull/3376) feat: allow setting unix socket file mode when declaring listener (@Tristan971 / @tuunit)