build: switch version to 1.0.0-M1

This will be a milestone release first to test workflows and enable people to start testing the parent POM without relying on snapshot

Author: poikilotherm

pom.xml

@@ -4,7 +4,7 @@
 
     <groupId>io.gdcc.export</groupId>
     <artifactId>parent</artifactId>
-    <version>1.0.0-SNAPSHOT</version>
+    <version>1.0.0-M1-SNAPSHOT</version>
 
     <modules>
         <module>example</module>