Upgrade proposals fail execution

[jgryffindor]

Describe the bug
Upgrade proposals submitted through the UI are failing execution with the error:

proposal execution failed on proposal 5, because of error message /cosmos.upgrade.v1beta1.MsgSoftwareUpgrade at position 0: time-based upgrades have been deprecated in the SDK: invalid request

https://qa-wallet.liftedinit.tech/groups?policyAddress=manifest1afk9zr2hn2jsac63h4hm60vl9z3e5u69gndzf7c99cqge3vzwjzsfmy9qj&tab=history

To Reproduce
Steps to reproduce the behavior:

1. Go to Admin
2. Submit upgrade proposal
3. Vote on the proposal
4. Execute after voting period

Screenshots
If applicable, add screenshots to help explain your problem.

Smartphone (please complete the following information):

• Brave Browser - MacOS

[fmorency]

@chalabi2

This issue stems from telescope. The time field of Plan is deprecated, and any value other than an empty field will throw an error, as documented in 1.

The toAmino() function of Plan creates a Date() if the field is empty.

[fmorency]

Details in hyperweb-io/telescope#729