Add 9.2.6 to ghc-version-support.md (haskell#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 |