Port v0.79.1 changes to main branch (#4773)

## Describe your changes

The `v0.79.1` release contained two bug fixes:
https://github.com/penumbra-zone/penumbra/releases/tag/v0.79.1 Those
changes were committed directly to the `release/v0.79.x` branch:

* #4716
* #4718

Typically, we prepare fixes for the `main` branch, then backport them
via cherry-pick into the relevant release branch. That process wasn't
adhered to for 0.79.1, so I'm following up to ensure we have all the
relevant changes we need in main.

## Checklist before requesting a review

- [x] If this code contains consensus-breaking changes, I have added the
"consensus-breaking" label. Otherwise, I declare my belief that there
are not consensus-breaking changes, for the following reason:

> These changes have already been released, as part of `v0.79.1` (and
therefore `v0.79.2`), so pulling them into main just ensures we don't
inadvertently unship them.

---------

Co-authored-by: Henry de Valence <[email protected]>

Cargo.toml

@@ -154,7 +154,7 @@ humantime                        = { version = "2.1" }
 ibc-proto                        = { default-features = false, version = "0.41.0" }
 ibc-types                        = { default-features = false, version = "0.12.0" }
 ibig                             = { version = "0.3" }
-ics23                            = { version = "0.11.0" }
+ics23                            = { version = "0.11.3" }
 im                               = { version = "^15.1.0" }
 indicatif                        = { version = "0.16" }
 jmt                              = { version = "0.10", features = ["migration"] }

crates/core/component/governance/src/component/view.rs

@@ -546,7 +546,7 @@ pub trait StateReadExt: StateRead + penumbra_stake::StateReadExt {
                 // proposal start, minus the total voting power used by delegators to that validator
                 // who have voted. Their votes will be added back in below, re-assigning their
                 // voting power to their chosen votes.
-                let effective_power = power - delegator_tally.total();
+                let effective_power = power.saturating_sub(delegator_tally.total());
                 tally += (vote, effective_power).into();
             }
             // Add the delegator votes in, regardless of if the validator has voted.

tools/proto-compiler/Cargo.toml

@@ -7,7 +7,7 @@ publish = false
 [dependencies]
 anyhow = "1"
 ibc-proto = { version = "0.40.0" }
-ics23 = "0.11.0"
+ics23 = "0.11.3"
 pbjson = "0.6"
 pbjson-build = "0.6"
 pbjson-types = "0.6"