Bump mssql-jdbc in /modules/mssqlserver

Bumps [mssql-jdbc](https://github.com/Microsoft/mssql-jdbc) from 9.3.1.jre8-preview to 9.4.0.jre8.
- [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)

---
updated-dependencies:
- dependency-name: com.microsoft.sqlserver:mssql-jdbc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

modules/mssqlserver/build.gradle

@@ -10,12 +10,12 @@ dependencies {
     compileOnly 'io.r2dbc:r2dbc-mssql:0.8.6.RELEASE'
 
     testImplementation project(':jdbc-test')
-    testImplementation 'com.microsoft.sqlserver:mssql-jdbc:9.3.1.jre8-preview'
+    testImplementation 'com.microsoft.sqlserver:mssql-jdbc:9.4.0.jre8'
 
     testImplementation project(':r2dbc')
     testImplementation 'io.r2dbc:r2dbc-mssql:0.8.5.RELEASE'
 
     // MSSQL's wait strategy requires the JDBC driver
     testImplementation testFixtures(project(':r2dbc'))
-    testImplementation 'com.microsoft.sqlserver:mssql-jdbc:9.3.1.jre8-preview'
+    testImplementation 'com.microsoft.sqlserver:mssql-jdbc:9.4.0.jre8'
 }