build(deps): bump github.com/go-sql-driver/mysql from 1.7.0 to 1.8.1

Bumps [github.com/go-sql-driver/mysql](https://github.com/go-sql-driver/mysql) from 1.7.0 to 1.8.1.
- [Release notes](https://github.com/go-sql-driver/mysql/releases)
- [Changelog](https://github.com/go-sql-driver/mysql/blob/v1.8.1/CHANGELOG.md)
- [Commits](go-sql-driver/mysql@v1.7.0...v1.8.1)

---
updated-dependencies:
- dependency-name: github.com/go-sql-driver/mysql
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -3,6 +3,6 @@ module gorm.io/driver/mysql
 go 1.14
 
 require (
-	github.com/go-sql-driver/mysql v1.7.0
+	github.com/go-sql-driver/mysql v1.8.1
 	gorm.io/gorm v1.25.7
 )

go.sum

@@ -1,5 +1,7 @@
-github.com/go-sql-driver/mysql v1.7.0 h1:ueSltNNllEqE3qcWBTD0iQd3IpL/6U+mJxLkazJ7YPc=
-github.com/go-sql-driver/mysql v1.7.0/go.mod h1:OXbVy3sEdcQ2Doequ6Z5BW6fXNQTmx+9S1MCJN5yJMI=
+filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
+filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
+github.com/go-sql-driver/mysql v1.8.1 h1:LedoTUt/eveggdHS9qUFC1EFSa8bU2+1pZjSRpvNJ1Y=
+github.com/go-sql-driver/mysql v1.8.1/go.mod h1:wEBSXgmK//2ZFJyE+qWnIsVGmvmEKlqwuVSjsCm7DZg=
 github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
 github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
 github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=