Force building with ghc-9.6.5

The default makepkg configuration sets LDFLAGS but not LD.
GHC used to take this as its cue to select its own choice of LD.
However GHC would *not* check that its choice of LD supports LDFLAGS.
This is a problem for dependencies with C components, which get linked
using this LD.

A fix[1] for this has landed in ghc 9.6.5 on 2024-04-16, and ghc's
installed using the current ghcup HEAD (starting with 7a684ad[2]) will
have `--disable-ld-override` passed, which also fixes the issue.

[1] - https://gitlab.haskell.org/ghc/ghc/-/issues/24565
[2] - haskell/ghcup-hs#1032

PKGBUILD

@@ -40,7 +40,11 @@ EOF
 
 prepare() {
     cd "$pkgname"
-    stack config set resolver lts-22.13 # ghc-9.6.4
+    stack config set resolver lts-22.19 # ghc-9.6.4
+    echo 'compiler: ghc-9.6.5' >> stack.yaml
+
+    _bumpVer Cabal 3.10.3.0 # 3.12.0.0
+    _bumpVer Cabal-syntax 3.10.3.0 # 3.12.0.0
     _bumpVer texmath 0.12.8.8
     _bumpVer typst 0.5.0.3
     _bumpVer typst-symbols 0.1.6