Bump r2dbc-h2 from 0.8.0.RELEASE to 0.8.1.RELEASE (#135)

Bumps [r2dbc-h2](https://github.com/r2dbc/r2dbc-h2) from 0.8.0.RELEASE to 0.8.1.RELEASE.
- [Release notes](https://github.com/r2dbc/r2dbc-h2/releases)
- [Changelog](https://github.com/r2dbc/r2dbc-h2/blob/master/CHANGELOG)
- [Commits](r2dbc/r2dbc-h2@v0.8.0.RELEASE...v0.8.1.RELEASE)

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

build.gradle

@@ -132,7 +132,7 @@ dependencies {
     implementation('org.locationtech.jts:jts-core:1.16.1')
     implementation('io.r2dbc:r2dbc-spi:0.8.0.RELEASE')
     runtime('io.r2dbc:r2dbc-pool:0.8.0.RELEASE')
-    implementation('io.r2dbc:r2dbc-h2:0.8.0.RELEASE')
+    implementation('io.r2dbc:r2dbc-h2:0.8.1.RELEASE')
     runtime('io.r2dbc:r2dbc-postgresql:0.8.0.RELEASE')
     implementation('org.eclipse.jgit:org.eclipse.jgit:5.5.1.201910021850-r')
     implementation('org.springframework.boot:spring-boot-starter-mail')