Try removing upper bound on lens as it is required for GHC 9.0.1 (#5874)

build-constraints.yaml

@@ -1,6 +1,6 @@
-ghc-major-version: "9.0"
+ghc-major-version: "8.10"
 # new curator is supposed to use exact GHC version
-ghc-version: "9.0.1"
+ghc-version: "8.10.4"
 
 # This affects which version of the Cabal file format we allow. We
 # should ensure that this is always no greater than the version
@@ -5038,6 +5038,19 @@ packages:
         - Win32 == 2.6.1.0
 
     #"Broken with GHC 9.0.1":
+    #  # Cabal-3.4.0.0 but upper bounded to <3.3
+    #  - Agda < 0
+    #  - cabal-rpm < 0
+    #  - entropy < 0
+    #  - fixed-vector-hetero < 0
+    #  - lens < 0
+    #  - packdeps < 0
+    #  - pantry < 0
+    #  - proto-lens-setup < 0
+    #  - servant-openapi3 < 0
+    #  - servant-swagger < 0
+    #  - singletons < 0
+    ##### old
     #  - Agda < 0
     #  - HTTP < 0
     #  - HaXml < 0
@@ -6857,7 +6870,7 @@ packages:
       - constraints < 0.13
 
       # https://github.com/commercialhaskell/stackage/issues/5874
-      - lens < 5
+      # lens < 5
 
       # https://github.com/commercialhaskell/stackage/issues/5875
       - heaps < 0.4