Upgrade dependencies.

[#149]

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

pom.xml

@@ -32,17 +32,17 @@
     <url>https://github.com/r2dbc/r2dbc-pool</url>
 
     <properties>
-        <assertj.version>3.21.0</assertj.version>
+        <assertj.version>3.22.0</assertj.version>
         <awaitility.version>4.1.1</awaitility.version>
         <java.version>1.8</java.version>
         <jsr305.version>3.0.2</jsr305.version>
         <junit.version>5.8.2</junit.version>
-        <logback.version>1.2.7</logback.version>
-        <mockito.version>4.1.0</mockito.version>
+        <logback.version>1.2.9</logback.version>
+        <mockito.version>4.2.0</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>2020.0.13</reactor.version>
+        <reactor.version>2020.0.15-SNAPSHOT</reactor.version>
     </properties>
 
     <licenses>
@@ -400,4 +400,14 @@
 
     </profiles>
 
+    <repositories>
+        <repository>
+            <id>spring-libs-snapshot</id>
+            <url>https://repo.spring.io/libs-snapshot</url>
+            <snapshots>
+                <enabled>true</enabled>
+            </snapshots>
+        </repository>
+    </repositories>
+
 </project>