Fix typo in Json unmarshaling

[marckhouzam]

Description of the Change

I noticed this typo in the json tag. Searching the code with my IDE, I don't see any use of the field OAuthClient except in a test. Furthermore, I believe this field (and its parents) are not marshalled but only unmarshalled. I am not 100% sure however. But if that is the case, it is safe to make this change since it won't break anything.

Note also that from limited testing, I can see that when requesting the links from a fondation, the app_ssh link section is served using oauth_client as shown below

    "app_ssh": {
      "href": "ssh.sys.tas.3e03f83b.shepherd.tanzu.broadcom.net:2222",
      "meta": {
        "host_key_fingerprint": "31:9e:8e:e5:77:80:f3:f5:fc:c1:32:d7:23:cc:ce:a1",
        "oauth_client": "ssh-proxy"
      }
    },

This means that without this PR, if the field OAuthClient were to be used in the future, it would not work, as it would never be filled when unmarshaling.

Why Is This PR Valuable?

This PR is just about avoiding someone wasting time in the future trying to make this field work and hitting this bug.

Applicable Issues

N/A

How Urgent Is The Change?

Not urgent.

Other Relevant Parties

No one, yet.

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• ✅ login: marckhouzam / name: Marc Khouzam (022e078)