Remove repository declarations from pom file.

See gh-470.

spring-vault-dependencies/pom.xml

@@ -181,16 +181,6 @@
 		</plugins>
 	</build>
 
-	<repositories>
-		<repository>
-			<id>spring-libs-snapshot</id>
-			<url>https://repo.spring.io/libs-snapshot</url>
-			<snapshots>
-				<enabled>true</enabled>
-			</snapshots>
-		</repository>
-	</repositories>
-
 	<profiles>
 		<profile>