* Add simapp v8 to CI jobs

* Add simapp v8 to nix flake

* Handle CLI breaking changes of Cosmos SDK v0.50 in test bootstrap

* Handle genesis config 'voting_perdiod' and CLI 'query txs' changes for Cosmos SDK v0.50.1

* Use 'MsgSubmitProposal' instead of deprecated 'UpgradeProposal' to initiate a chain upgrade

* Update 'tx upgrade-chain' CLI template

* Fix 'tx chain-upgrade' tests

* Update chain upgrade for compatibility between different ibc-go versions

* Improve assertion for client upgrade tests

* Update ibc-proto-rs to v0.39.0

* Add changelog entry

* Fix and improve guide section for client upgrade

* Wait before querying client state for client upgrade tests

* Apply suggestions from code review

Co-authored-by: Romain Ruetschi <romain@informal.systems>
Signed-off-by: Luca Joss <43531661+ljoss17@users.noreply.github.com>

* Rename method 'ibc_version()' to 'version_specs'

* Extract the verification of legacy version in a method

* Implement 'FromStr' instead of 'TryFrom<String>' for 'ProposalStatus'

* Fix cargo-doc warning

* Add changelog entry for CLI

* Change the '--gov-account' flag as optional but will fail if trying to upgrade a chain with ibc-go v8+

* Update guide

* Move and update changelog entry for CLI

* Return a 'Specs' struct in 'version_specs()' method

* Fix clippy errors

---------

Signed-off-by: Luca Joss <43531661+ljoss17@users.noreply.github.com>
Co-authored-by: Romain Ruetschi <romain@informal.systems>

* Update Gaia v12 to v13 and v14 in tests

* Fix Celestia CI job