We bump the go.mod version to 1.18 and run go mod tidy. This is required for using new features. ```release-note NONE ```
https://mattermost.atlassian.net/browse/MM-40676 ```release-note NONE ```
* MM-37186: Update dependencies The split client libraries were excluded from being upgraded. See: https://github.com/splitio/go-split-commons/issues/56 https://mattermost.atlassian.net/browse/MM-37186 ```release-note NONE ``` * Ignore staticcheck deprecation warnings ```release-note NONE ```