Remove exclude for google.golang.org/grpc v1.69.0 from go.mod

[csatib02]

Preflight Checklist

• I have searched the issue tracker for an issue that matches the one I want to file, without success.
• I am not looking for support or already pursued the available support channels without success.
• I agree to follow the Code of Conduct.

Vault SDK Version

latest

Expected Behavior

Workaround placed in because of googleapis/google-cloud-go#11283

Actual Behavior

Remove the exclude added in: #486, once googleapis/google-cloud-go#11283 is merged.

Steps To Reproduce

No response

Additional Information

No response

[github-actions]

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