VERSION: Update version to v1.6.0-rc2

Change-Id: I3d62baf6083a5ae2936ec16771e8e3a5a213181f
Signed-off-by: Anastasia Klimchuk <aklm@flashrom.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/88459
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Peter Marheine <pmarheine@chromium.org>
diff --git a/VERSION b/VERSION
index fdaa68a..b59d0e5 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-v1.6.0-rc1
+v1.6.0-rc2