Bump io.projectreactor:reactor-bom from 2020.0.38 to 2020.0.39

Bumps [io.projectreactor:reactor-bom](https://github.com/reactor/reactor) from 2020.0.38 to 2020.0.39.
- [Release notes](https://github.com/reactor/reactor/releases)
- [Commits](reactor/reactor@2020.0.38...2020.0.39)

---
updated-dependencies:
- dependency-name: io.projectreactor:reactor-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

gradle/libs.versions.toml

@@ -31,7 +31,7 @@ commons-collections = "commons-collections:commons-collections:3.2.2"
 io-freefair-gradle-aspectj-plugin = "io.freefair.gradle:aspectj-plugin:6.5.1"
 io-mockk = "io.mockk:mockk:1.13.3"
 io-projectreactor-netty-reactor-netty = "io.projectreactor.netty:reactor-netty:1.0.39"
-io-projectreactor-reactor-bom = "io.projectreactor:reactor-bom:2020.0.38"
+io-projectreactor-reactor-bom = "io.projectreactor:reactor-bom:2020.0.39"
 io-projectreactor-tools-blockhound = "io.projectreactor.tools:blockhound:1.0.8.RELEASE"
 io-r2dbc-r2dbc-h2 = { module = "io.r2dbc:r2dbc-h2", version.ref = "io-r2dbc" }
 io-r2dbc-r2dbc-spi-test = { module = "io.r2dbc:r2dbc-spi-test", version.ref = "io-r2dbc" }