[cherry-pick] Use restic 0.11.0 (#567) (#578)

/cherry-pick

Signed-off-by: 1gtm <1gtm@appscode.com>

Author: 1gtm

Makefile

@@ -48,7 +48,7 @@ else
 	endif
 endif
 
-RESTIC_VER       := 0.10.0
+RESTIC_VER       := 0.11.0
 
 ###
 ### These variables should not need tweaking.