MM-43753: Go mod tidy for 1.18 (#20073)

We bump the go.mod version to 1.18
and run go mod tidy.

This is required for using new features.

```release-note
NONE
```

vendor/github.com/go-sql-driver/mysql/go.mod

@@ -1,3 +0,0 @@
-module github.com/go-sql-driver/mysql
-
-go 1.10