patch 9.1.0421: filetype: hyprlang files are not recognized

Problem:  filetype: hyprlang files are not recognized
Solution: recognize 'hypr{land,paper,idle,lock}.conf' files
          as 'hyprlang' filetype, add hyprlang ftplugin
          (Riley Bruins)

closes: #14803

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 9e2253b..eeca7a1 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -336,6 +336,7 @@
     htmlm4: ['file.html.m4'],
     httest: ['file.htt', 'file.htb'],
     hurl: ['file.hurl'],
+    hyprlang: ['hyprlock.conf', 'hyprland.conf', 'hypridle.conf', 'hyprpaper.conf'],
     i3config: ['/home/user/.i3/config', '/home/user/.config/i3/config', '/etc/i3/config', '/etc/xdg/i3/config'],
     ibasic: ['file.iba', 'file.ibi'],
     icemenu: ['/.icewm/menu', 'any/.icewm/menu'],
diff --git a/src/version.c b/src/version.c
index aafbddc..df50a43 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    421,
+/**/
     420,
 /**/
     419,