Bump r2dbc-mssql in /modules/mssqlserver

Bumps [r2dbc-mssql](https://github.com/r2dbc/r2dbc-mssql) from 0.8.6.RELEASE to 0.8.7.RELEASE.
- [Release notes](https://github.com/r2dbc/r2dbc-mssql/releases)
- [Changelog](https://github.com/r2dbc/r2dbc-mssql/blob/v0.8.7.RELEASE/CHANGELOG)
- [Commits](r2dbc/r2dbc-mssql@v0.8.6.RELEASE...v0.8.7.RELEASE)

---
updated-dependencies:
- dependency-name: io.r2dbc:r2dbc-mssql
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

modules/mssqlserver/build.gradle

@@ -7,13 +7,13 @@ dependencies {
     api project(':jdbc')
 
     compileOnly project(':r2dbc')
-    compileOnly 'io.r2dbc:r2dbc-mssql:0.8.6.RELEASE'
+    compileOnly 'io.r2dbc:r2dbc-mssql:0.8.7.RELEASE'
 
     testImplementation project(':jdbc-test')
     testImplementation 'com.microsoft.sqlserver:mssql-jdbc:9.4.0.jre8'
 
     testImplementation project(':r2dbc')
-    testImplementation 'io.r2dbc:r2dbc-mssql:0.8.5.RELEASE'
+    testImplementation 'io.r2dbc:r2dbc-mssql:0.8.7.RELEASE'
 
     // MSSQL's wait strategy requires the JDBC driver
     testImplementation testFixtures(project(':r2dbc'))