Test on 1.12 (#2707)

Now that Libtask works on 1.12, I think we can and should run CI on it.

Mooncake can be disabled for the time being (it will still be tested in
on 1.10).

Author: penelopeysm

.github/workflows/Tests.yml

@@ -35,23 +35,20 @@ jobs:
           - name: "everything else"
             args: "--skip mcmc/gibbs.jl mcmc/Inference.jl ad.jl"
         runner:
-          # TODO(mhauru) All the ones below that run on 1.11 should actually be run on 1.
-          # The current setup is a temporary arrangement to deal with issues where Mooncake
-          # and Libtask are broken on 1.12.
           # Default
-          - version: '1.11'
+          - version: '1'
             os: ubuntu-latest
             num_threads: 1
           # Multithreaded
-          - version: '1.11'
+          - version: '1'
             os: ubuntu-latest
             num_threads: 2
           # Windows
-          - version: '1.11'
+          - version: '1'
             os: windows-latest
             num_threads: 1
           # macOS
-          - version: '1.11'
+          - version: '1'
             os: macos-latest
             num_threads: 1
           # Minimum supported Julia version

test/ad.jl

@@ -11,7 +11,7 @@ using ..Models: gdemo_default
 import ForwardDiff, ReverseDiff
 
 # Skip Mooncake on 1.12 as it is not compatible yet
-const INCLUDE_MOONCAKE = VERSION >= v"1.12"
+const INCLUDE_MOONCAKE = VERSION < v"1.12"
 if INCLUDE_MOONCAKE
     import Pkg
     Pkg.add("Mooncake")