release: Zephyr 3.3.0-rc3

This commit sets the Zephyr version to v3.3.0-rc3.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
diff --git a/VERSION b/VERSION
index 6a0f2d9..355893b 100644
--- a/VERSION
+++ b/VERSION
@@ -2,4 +2,4 @@
 VERSION_MINOR = 3
 PATCHLEVEL = 0
 VERSION_TWEAK = 0
-EXTRAVERSION = rc2
+EXTRAVERSION = rc3