Remove sourcehut tree-sitter grammars from default build (#9316)

Sourcehut has outages occasionally that cause the CI and from-source
builds to fail. It also doesn't setup redirects when a user renames
themselves, so if a user that publishes a tree-sitter grammar we use
changes their sourcehut name then it breaks the build and any prior
builds using that grammar.

For now let's remove them from the default build. It's a bandaid over
a larger reliability and trust problem with the grammar repositories
but it should fix the build for now.

languages.toml

@@ -1,6 +1,8 @@
 # Language support configuration.
 # See the languages documentation: https://docs.helix-editor.com/master/languages.html
 
+use-grammars = { except = [ "hare", "wren", "gemini" ] }
+
 [language-server]
 
 als = { command = "als" }