fix oidc document serialization.

[codecov[bot]]

Codecov Report

Attention: 29 lines in your changes are missing coverage. Please review.

:exclamation: No coverage uploaded for pull request base (v1@f37095a). Click here to learn what that means.

Files	Patch %	Lines
pkg/collector/spec.go	0.00%	29 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v1 #681 +/- ## ==================================== Coverage ? 1.35% ==================================== Files ? 71 Lines ? 7247 Branches ? 0 ==================================== Hits ? 98 Misses ? 7144 Partials ? 5 ``` | [Flag](https://app.codecov.io/gh/nitrictech/cli/pull/681/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nitrictech) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/nitrictech/cli/pull/681/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nitrictech) | `1.35% <0.00%> (?)` | | 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=nitrictech#carryforward-flags-in-the-pull-request-comment) to find out more.

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