Add 9.2.6 to ghc-version-support.md (#3494)

Author: wz1000

docs/support/ghc-version-support.md

@@ -21,6 +21,7 @@ Support status (see the support policy below for more details):
 | 9.4.3        | [latest](https://github.com/haskell/haskell-language-server/releases/latest)       | full support                                                                |
 | 9.4.2        | [1.8.0.0](https://github.com/haskell/haskell-language-server/releases/tag/1.8.0.0) | full support                                                                |
 | 9.4.1        | [1.8.0.0](https://github.com/haskell/haskell-language-server/releases/tag/1.8.0.0) | full support                                                                |
+| 9.2.6        | [latest](https://github.com/haskell/haskell-language-server/releases/latest)       | full support                                                                |
 | 9.2.5        | [latest](https://github.com/haskell/haskell-language-server/releases/latest)       | full support                                                                |
 | 9.2.4        | [1.8.0.0](https://github.com/haskell/haskell-language-server/releases/tag/1.8.0.0) | full support                                                                |
 | 9.2.3        | [1.8.0.0](https://github.com/haskell/haskell-language-server/releases/tag/1.8.0.0) | full support                                                                |