Bump tendermint-rs to 0.38

[yito88]

[Farhad-Shabani]

@erwanor appreciate merging this PR. Thanks!

[larry0x]

tendermint-rs 0.40 is already out. Need to bump to 0.40...

[erwanor]

Sorry I was out for a bit, we will get a couple releases out shortly

[erwanor]

@yito88 @larry0x heya, a few new releases are out:

• 0.16 ([email protected])
• 0.17 ([email protected])
• 0.18 ([email protected])

Sorry this took so long, we're going back to the regular cadence of updates now..

[larry0x]

Thank you!