Bump th-desugar source-repository-package to 1.18

Author: RyanGlScott

.github/workflows/haskell-ci.yml

@@ -258,7 +258,7 @@ jobs:
           source-repository-package
             type:     git
             location: https://github.com/goldfirere/th-desugar
-            tag:      730a0ed799c91324d42b70d3780d6b3215cafc3c
+            tag:      44158f7bb7faa2022795446505217b5e52862da5
           EOF
           if $HEADHACKAGE; then
           echo "$($HCPKG list --simple-output | xargs -d' ' -n 1 | grep -v "^Cabal" | sed -E 's/([a-zA-Z-]+)-[0-9.]+/allow\-newer\: *:\1/g')" >> cabal.project

cabal.project

@@ -6,4 +6,4 @@ packages: ./singletons
 source-repository-package
   type: git
   location: https://github.com/goldfirere/th-desugar
-  tag: 730a0ed799c91324d42b70d3780d6b3215cafc3c
+  tag: 44158f7bb7faa2022795446505217b5e52862da5