Bump template-haskell version for GHC 9.4

Currently, GHC 9.4.1-alpha1 ships with template-haskell with version 2.18.0.0, which is the same version that GHC 9.2 bundles. But there have been changes to the template-haskell version that GHC 9.4.1-alpha1 includes (see here), which means that one can't guard against new changes with MIN_VERSION_template_haskell. (The closest one can get is #if __GLASGOW_HASKELL__ >= 904, which isn't quite as precise.)

To fix this, the template-haskell version should be bumped accordingly.

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