fix: Drop support for Emacs 26.x (#757)

Author: jcs090218

.github/workflows/test.yml

@@ -21,7 +21,6 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         emacs-version:
-          - 26.3
           - 27.1
           - 27.2
           - 28.1

Eask

@@ -14,7 +14,7 @@
 (source "gnu")
 (source "melpa")
 
-(depends-on "emacs" "26.3")
+(depends-on "emacs" "27.1")
 (depends-on "dash")
 (depends-on "flycheck")
 (depends-on "lsp-mode")

lsp-ui.el

@@ -6,7 +6,7 @@
 ;; Author: Sebastien Chapuis <[email protected]>, Fangrui Song <[email protected]>
 ;; Keywords: languages, tools
 ;; URL: https://github.com/emacs-lsp/lsp-ui
-;; Package-Requires: ((emacs "26.1") (dash "2.18.0") (lsp-mode "6.0") (markdown-mode "2.3"))
+;; Package-Requires: ((emacs "27.1") (dash "2.18.0") (lsp-mode "6.0") (markdown-mode "2.3"))
 ;; Version: 8.0.1
 
 ;;; License