chore(injections)!: update injection syntax to 0.9

Since 0.9, @lang syntax is still available as fallback but will soon be deprecated.
Because of that, new syntax should be adopted once 0.9 becomes the
baseline requirements for nvim-treesitter

- update health check
- update doc

queries/html/injections.scm

@@ -3,8 +3,10 @@
 (element
   (start_tag
     (tag_name) @_py_script)
-  (text) @python
-  (#any-of? @_py_script "py-script" "py-repl"))
+  (text) @injection.content
+  (#any-of? @_py_script "py-script" "py-repl")
+  (#set! injection.language "python")
+  (#set! injection.include-children))
 
 (script_element
   (start_tag
@@ -12,13 +14,17 @@
       (attribute_name) @_attr 
       (quoted_attribute_value 
         (attribute_value) @_type)))
-  (raw_text) @python
+  (raw_text) @injection.content
   (#eq? @_attr "type")
   ; not adding type="py" here as it's handled by html_tags 
-  (#any-of? @_type "pyscript" "py-script"))
+  (#any-of? @_type "pyscript" "py-script")
+  (#set! injection.language "python")
+  (#set! injection.include-children))
 
 (element
   (start_tag
     (tag_name) @_py_config)
-  (text) @toml
-  (#eq? @_py_config "py-config"))
+  (text) @injection.content
+  (#eq? @_py_config "py-config")
+  (#set! injection.language "toml")
+  (#set! injection.include-children))