Bump mssql-jdbc from 9.1.1.jre8-preview to 9.3.1.jre8-preview in /modules/mssqlserver (#4048)

Bumps [mssql-jdbc](https://github.com/Microsoft/mssql-jdbc) from 9.1.1.jre8-preview to 9.3.1.jre8-preview.
- [Release notes](https://github.com/Microsoft/mssql-jdbc/releases)
- [Changelog](https://github.com/microsoft/mssql-jdbc/blob/dev/CHANGELOG.md)
- [Commits](https://github.com/Microsoft/mssql-jdbc/commits)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

modules/mssqlserver/build.gradle

@@ -10,12 +10,12 @@ dependencies {
     compileOnly 'io.r2dbc:r2dbc-mssql:0.8.6.RELEASE'
 
     testCompile project(':jdbc-test')
-    testCompile 'com.microsoft.sqlserver:mssql-jdbc:9.1.1.jre8-preview'
+    testCompile 'com.microsoft.sqlserver:mssql-jdbc:9.3.1.jre8-preview'
 
     testCompile project(':r2dbc')
     testCompile 'io.r2dbc:r2dbc-mssql:0.8.5.RELEASE'
 
     // MSSQL's wait strategy requires the JDBC driver
     testCompile testFixtures(project(':r2dbc'))
-    testCompile 'com.microsoft.sqlserver:mssql-jdbc:9.1.1.jre8-preview'
+    testCompile 'com.microsoft.sqlserver:mssql-jdbc:9.3.1.jre8-preview'
 }