release: move version to 1.11.0-rc3

Update VERSION file to 1.11.0-rc3. This should have been done for the
earlier 1.11.0-rcX releases but was forgotten.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
diff --git a/VERSION b/VERSION
index 60f4c5e..4043293 100644
--- a/VERSION
+++ b/VERSION
@@ -1,5 +1,5 @@
 VERSION_MAJOR = 1
-VERSION_MINOR = 10
-PATCHLEVEL = 99
+VERSION_MINOR = 11
+PATCHLEVEL = 0
 VERSION_TWEAK = 0
-EXTRAVERSION =
+EXTRAVERSION = rc3