temporarily bump ghc to 9.12.3.20260311 for testing RC1 (#7967)

also need to disable perf, prettychart, web-rep stack (tonyday567/web-rep#14)

automated/build.sh

@@ -158,6 +158,8 @@ docker run -t $ARGS_BUILD $IMAGE nice -n 15 /bin/bash -c "
     exec sudo -E -u $USER env \"HOME=$HOME\" \"PATH=\$PATH\" curator build --jobs $JOBS
     "
 
+exit 1
+
 # Make sure we actually need this snapshot. We used to perform this check
 # exclusively before building. Now we perform it after as well for the case of
 # nightly, where we don't perform this check beforehand. This is also slightly

build-constraints.yaml

@@ -1,7 +1,7 @@
 ghc-major-version: "9.12"
 
 # new curator is supposed to use exact GHC version
-ghc-version: "9.12.3"
+ghc-version: "9.12.3.20260311"
 
 # This affects which version of the Cabal file format we allow. We
 # should ensure that this is always no greater than the version
@@ -3757,9 +3757,9 @@ packages:
         - mealy
         - numhask
         - numhask-space
-        - perf
-        - prettychart
-        - web-rep
+        - perf < 0
+        - prettychart < 0
+        - web-rep < 0
 
     "Iphigenia Df <iphydf@gmail.com> @iphydf":
         - data-msgpack