POM: replace SNAPSHOT dependency of mastodon-collection

pom.xml

@@ -41,7 +41,7 @@
 		<dependency>
 			<groupId>org.mastodon</groupId>
 			<artifactId>mastodon-collection</artifactId>
-			<version>1.0.0-beta-26-SNAPSHOT</version>
+			<version>${mastodon-collection.version}</version>
 		</dependency>
 
 		<dependency>
@@ -113,8 +113,9 @@
 		<license.organizationName>Mastodon authors</license.organizationName>
 		<license.copyrightOwners>Matthias Arzt</license.copyrightOwners>
 
-		<mastodon.version>1.0.0-beta-29</mastodon.version>
+		<mastodon.version>1.0.0-beta-30</mastodon.version>
 		<mastodon-tomancak.version>0.4.2</mastodon-tomancak.version>
+		<mastodon-collection.version>1.0.0-beta-26</mastodon-collection.version>
 
 		<!-- NB: Deploy releases to the SciJava Maven repository. -->
 		<releaseProfiles>sign,deploy-to-scijava</releaseProfiles>