release: Zephyr 3.0.0

Update version for release v3.0.0

Signed-off-by: Dan Kalowsky <dank@deadmime.org>
diff --git a/VERSION b/VERSION
index 9ad8021..506d6d4 100644
--- a/VERSION
+++ b/VERSION
@@ -2,4 +2,4 @@
 VERSION_MINOR = 0
 PATCHLEVEL = 0
 VERSION_TWEAK = 0
-EXTRAVERSION = rc3
+EXTRAVERSION =