release: Zephyr v3.0.0-rc3

Bump version file to Zephyr v3.0.0-rc3

Signed-off-by: Dan Kalowsky <dank@deadmime.org>
diff --git a/VERSION b/VERSION
index a6eb837..9ad8021 100644
--- a/VERSION
+++ b/VERSION
@@ -2,4 +2,4 @@
 VERSION_MINOR = 0
 PATCHLEVEL = 0
 VERSION_TWEAK = 0
-EXTRAVERSION = rc2
+EXTRAVERSION = rc3