Allow hackage-security 0.6.2.6, restore testing it

This closes #7365 and should help with #7357.
- #7365
- #7357

build-constraints.yaml

@@ -143,7 +143,7 @@ packages:
         - test-framework
         - c2hs
         - cabal-doctest
-        - hackage-security < 0.6.2.5 # https://github.com/commercialhaskell/stackage/issues/7357
+        - hackage-security
         - haskell-lexer
         - lifted-async
         - polyparse
@@ -9070,8 +9070,6 @@ skipped-tests:
     - incremental-parser # Main: executable not found
     - streamt # executable not found
 
-    - hackage-security # https://github.com/commercialhaskell/stackage/issues/7365
-
 # end of skipped-tests
 
 # Tests listed in expected-test-failures configure correctly but may fail to run