don't use tasty 1.5.1

tasty 1.5.1, which was just released, appears to be API-incompatible
with 1.5. Adjust dependencies to exclude it.

cabal-install/cabal-install.cabal

@@ -348,7 +348,7 @@ test-suite unit-tests
           tar,
           time,
           zlib,
-          tasty >= 1.2.3 && <1.6,
+          tasty >= 1.2.3 && <1.5.1,
           tasty-golden >=2.3.1.1 && <2.4,
           tasty-quickcheck,
           tasty-expected-failure,
@@ -379,7 +379,7 @@ test-suite mem-use-tests
   build-depends:
         cabal-install,
         containers,
-        tasty >= 1.2.3 && <1.6,
+        tasty >= 1.2.3 && <1.5.1,
         tasty-hunit >= 0.10
 
 
@@ -399,7 +399,7 @@ test-suite integration-tests2
         containers,
         directory,
         filepath,
-        tasty >= 1.2.3 && <1.6,
+        tasty >= 1.2.3 && <1.5.1,
         tasty-hunit >= 0.10,
         tagged
 
@@ -435,7 +435,7 @@ test-suite long-tests
         network-uri >= 2.6.2.0 && <2.7,
         random,
         tagged,
-        tasty >= 1.2.3 && <1.6,
+        tasty >= 1.2.3 && <1.5.1,
         tasty-expected-failure,
         tasty-hunit >= 0.10,
         tasty-quickcheck,