Bump mssql-jdbc from 8.4.1.jre8 to 9.1.0.jre8-preview in /modules/mss…

…qlserver (#3364)

Bumps [mssql-jdbc](https://github.com/Microsoft/mssql-jdbc) from 8.4.1.jre8 to 9.1.0.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)

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

modules/mssqlserver/build.gradle

@@ -10,12 +10,12 @@ dependencies {
     compileOnly 'io.r2dbc:r2dbc-mssql:0.8.4.RELEASE'
 
     testCompile project(':jdbc-test')
-    testCompile 'com.microsoft.sqlserver:mssql-jdbc:8.4.1.jre8'
+    testCompile 'com.microsoft.sqlserver:mssql-jdbc:9.1.0.jre8-preview'
 
     testCompile project(':r2dbc')
     testCompile 'io.r2dbc:r2dbc-mssql:0.8.3.RELEASE'
 
     // MSSQL's wait strategy requires the JDBC driver
     testCompile testFixtures(project(':r2dbc'))
-    testCompile 'com.microsoft.sqlserver:mssql-jdbc:8.4.1.jre8'
+    testCompile 'com.microsoft.sqlserver:mssql-jdbc:9.1.0.jre8-preview'
 }