system-linux-proc.cabal: Bump dependency upper bounds

Author: erikd

system-linux-proc.cabal

@@ -34,7 +34,7 @@ library
   build-depends:       base                          >= 4.8         && < 5.0
                      , attoparsec                    >= 0.12        && < 0.15
                      , bytestring                    >= 0.10        && < 0.13
-                     , containers                    >= 0.5         && < 0.8
+                     , containers                    >= 0.5         && < 0.9
                      , directory                     >= 1.2         && < 1.4
                      , errors                        == 2.3.*
                      , text                          >= 1.2         && < 2.2