Upgrade dependencies.

[#177]

Signed-off-by: Mark Paluch <mpaluch@vmware.com>

pom.xml

@@ -36,13 +36,13 @@
         <awaitility.version>4.2.0</awaitility.version>
         <java.version>1.8</java.version>
         <jsr305.version>3.0.2</jsr305.version>
-        <junit.version>5.8.2</junit.version>
+        <junit.version>5.9.0</junit.version>
         <logback.version>1.2.9</logback.version>
-        <mockito.version>4.6.1</mockito.version>
+        <mockito.version>4.7.0</mockito.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <r2dbc-spi.version>0.9.0.RELEASE</r2dbc-spi.version>
-        <reactor.version>2020.0.15</reactor.version>
+        <reactor.version>2020.0.22</reactor.version>
     </properties>
 
     <licenses>
@@ -196,7 +196,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-deploy-plugin</artifactId>
-                <version>2.8.2</version>
+                <version>3.0.0</version>
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
@@ -222,7 +222,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-javadoc-plugin</artifactId>
-                <version>3.4.0</version>
+                <version>3.4.1</version>
                 <configuration>
                     <links>
                         <link>https://r2dbc.io/spec/${r2dbc-spi.version}/api/</link>
@@ -268,7 +268,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>flatten-maven-plugin</artifactId>
-                <version>1.2.7</version>
+                <version>1.3.0</version>
                 <executions>
                     <execution>
                         <id>flatten</id>