Update deepseq submodule to 1.4.1.1 tag

This deepseq update drops the redundant ghc-prim dependency for GHC>=7.6

(cherry picked from commit c2833d60)

deepseq @ c6cb196f

-Subproject commit 56809c3e45c3a266564672b968817ca8b6d496c1
+Subproject commit c6cb196fb1bd5f16bb5945add2d6ece3f7910e90

testsuite/tests/safeHaskell/check/pkg01/safePkg01.stdout

@@ -29,17 +29,17 @@ trusted: safe
 require own pkg trusted: True
 
 M_SafePkg6
-package dependencies: array-0.5.0.1 base-4.8.0.0* bytestring-0.10.5.0* deepseq-1.4.1.0 ghc-prim-0.3.1.0 integer-gmp-0.5.1.0
+package dependencies: array-0.5.0.1 base-4.8.0.0* bytestring-0.10.6.0* deepseq-1.4.1.1 ghc-prim-0.3.1.0 integer-gmp-1.0.0.0
 trusted: trustworthy
 require own pkg trusted: False
 
 M_SafePkg7
-package dependencies: array-0.5.0.1 base-4.8.0.0* bytestring-0.10.5.0* deepseq-1.4.1.0 ghc-prim-0.3.1.0 integer-gmp-0.5.1.0
+package dependencies: array-0.5.0.1 base-4.8.0.0* bytestring-0.10.6.0* deepseq-1.4.1.1 ghc-prim-0.3.1.0 integer-gmp-1.0.0.0
 trusted: safe
 require own pkg trusted: False
 
 M_SafePkg8
-package dependencies: array-0.5.0.1 base-4.8.0.0 bytestring-0.10.5.0* deepseq-1.4.1.0 ghc-prim-0.3.1.0 integer-gmp-0.5.1.0
+package dependencies: array-0.5.0.1 base-4.8.0.0 bytestring-0.10.6.0* deepseq-1.4.1.1 ghc-prim-0.3.1.0 integer-gmp-1.0.0.0
 trusted: trustworthy
 require own pkg trusted: False
 

testsuite/tests/th/TH_Roles2.stderr

@@ -4,7 +4,7 @@ TYPE CONSTRUCTORS
   data T (a :: k)
 COERCION AXIOMS
 Dependent modules: []
-Dependent packages: [array-0.5.1.0, base-4.8.0.0, deepseq-1.4.1.0,
+Dependent packages: [array-0.5.1.0, base-4.8.0.0, deepseq-1.4.1.1,
                      ghc-prim-0.3.1.0, integer-gmp-1.0.0.0, pretty-1.1.2.0,
                      template-haskell-2.10.0.0]