[REF] Drop unsupported versions

* `anychar`, `literal` and more from `(rx ...)` missing
* `(font-lock-ensure)` missing and `(font-lock-fontify-buffer)` not producing
  the same results

Author: KeyWeeUsr

.github/workflows/test.yml

@@ -16,9 +16,6 @@ jobs:
         os:
           - ubuntu-latest
         emacs_version: [
-          '24.4',
-          '25.1', '25.2', '25.3',
-          '26.1', '26.2', '26.3',
           '27.1', '27.2',
           '28.1', '28.2',
           '29.1', '29.2', '29.3',

dbml-mode.el

@@ -5,7 +5,7 @@
 ;; Author: Peter Badida <keyweeusr@gmail.com>
 ;; Keywords: convenience, dbml, language, markup, highlight, dbdiagram, diagram
 ;; Version: 1.2.0
-;; Package-Requires: ((emacs "24.4"))
+;; Package-Requires: ((emacs "27.1"))
 ;; Homepage: https://github.com/KeyWeeUsr/dbml-mode
 
 ;; This program is free software; you can redistribute it and/or modify