docs: Add release notes for v6.0.0a6

DIRACGrid CI · DIRACGrid CI · commit 1debc0c8e9ee · 2024-02-21T10:09:15.000Z
diff --git a/release.notes b/release.notes
@@ -1,3 +1,6 @@
+[v6.0.0a6]
+
+
 [v6.0.0a5]
 
 CHANGE: (#753) Added VO selector to JobMonitor
