deps: bumping go version 1.18 (cosmos#1627) (cosmos#1637)

* bumping go version 1.18

* updating broken workflow setup

(cherry picked from commit 7d971ec)

Co-authored-by: Damian Nolan <damiannolan@gmail.com>

Author: 2 people

CHANGELOG.md

@@ -39,6 +39,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Dependencies
 
 * [\#1525](https://github.com/cosmos/ibc-go/pull/1525) Bump SDK version to v0.45.5
+* [\#1627](https://github.com/cosmos/ibc-go/pull/1627) Bump Go version to 1.18
 
 ### API Breaking