release: Zephyr 1.14-rc3

Bump to 1.14-rc3.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
diff --git a/VERSION b/VERSION
index 006ce5c..f64e912 100644
--- a/VERSION
+++ b/VERSION
@@ -2,4 +2,4 @@
 VERSION_MINOR = 14
 PATCHLEVEL = 0
 VERSION_TWEAK = 0
-EXTRAVERSION = rc2
+EXTRAVERSION = rc3