providers/oauth2: fix migration (cherry-pick #12138)

[gcp-cherry-pick-bot[bot]]

Cherry-picked providers/oauth2: fix migration (#12138)

Signed-off-by: Jens Langhammer jens@goauthentik.io

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.69%. Comparing base (5dab92f) to head (dce5e91). Report is 1 commits behind head on version-2024.8.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## version-2024.8 #12140 +/- ## ================================================== - Coverage 92.76% 92.69% -0.08% ================================================== Files 736 736 Lines 36729 36729 ================================================== - Hits 34072 34046 -26 - Misses 2657 2683 +26 ``` | [Flag](https://app.codecov.io/gh/goauthentik/authentik/pull/12140/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=goauthentik) | Coverage Δ | | |---|---|---| | [e2e](https://app.codecov.io/gh/goauthentik/authentik/pull/12140/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=goauthentik) | `49.01% <ø> (-0.12%)` | :arrow_down: | | [integration](https://app.codecov.io/gh/goauthentik/authentik/pull/12140/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=goauthentik) | `24.89% <ø> (ø)` | | | [unit](https://app.codecov.io/gh/goauthentik/authentik/pull/12140/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=goauthentik) | `90.29% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=goauthentik#carryforward-flags-in-the-pull-request-comment) to find out more.

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