Update docs and build flags to enable for 9.2

Author: eddiejessup

docs/support/plugin-support.md

@@ -65,4 +65,4 @@ For example, a plugin to provide a formatter which has itself been abandoned has
 | `hls-haddock-comments-plugin`       | 3    | 9.2, 9.4                 |
 | `hls-stan-plugin`                   | 3    | 8.6, 9.0, 9.2, 9.4       |
 | `hls-retrie-plugin`                 | 3    | 9.2, 9.4                 |
-| `hls-splice-plugin`                 | 3    | 9.2, 9.4                 |
+| `hls-splice-plugin`                 | 3    | 9.4                      |

haskell-language-server.cabal

@@ -266,7 +266,7 @@ common pragmas
     cpp-options: -Dhls_pragmas
 
 common splice
-  if flag(splice) && (impl(ghc < 9.2.1) || flag(ignore-plugins-ghc-bounds))
+  if flag(splice) && (impl(ghc < 9.4.1) || flag(ignore-plugins-ghc-bounds))
     build-depends: hls-splice-plugin ^>=1.0.0.1
     cpp-options: -Dhls_splice