[cherry-pick] Revert to restic 0.13.1 (#652) (#655)

/cherry-pick

Signed-off-by: Tamal Saha <tamal@appscode.com>

Signed-off-by: Tamal Saha <tamal@appscode.com>

Signed-off-by: Tamal Saha <tamal@appscode.com>
Co-authored-by: Tamal Saha <tamal@appscode.com>

Author: 1gtm

Makefile

@@ -42,7 +42,7 @@ else
 	endif
 endif
 
-RESTIC_VER       := 0.14.0
+RESTIC_VER       := 0.13.1
 
 ###
 ### These variables should not need tweaking.