fix: dragonberry fixes ported from Agoric-ag0

[JimLarson]

Description

Refs: Agoric/agoric-sdk#6461

Pulls changes from v0.45.4-alpha.agoric.ag0.2 => .3

Will tag as

• v0.45.4-alpha.agoric.2
• ics23/go/v0.8.0-alpha.agoric.1

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[michaelfig]

LGTM for the changes to existing Agoric branch. I only skimmed the vendored ics23 code, though, since I didn't know what to look for.

[JimLarson]

The failing test seems to be a known random issue, fixed in cosmos#12374.