patch 8.2.2523: Svelte filetype not recognized

Problem:    Svelte filetype not recognized.
Solution:   Add a detection rule. (Brian Ryall, closes #7858)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 06b8e99..ba8879c 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -427,6 +427,7 @@
     \ 'sdc': ['file.sdc'],
     \ 'sdl': ['file.sdl', 'file.pr'],
     \ 'sed': ['file.sed'],
+    \ 'svelte': ['file.svelte'],
     \ 'sensors': ['/etc/sensors.conf', '/etc/sensors3.conf', 'any/etc/sensors.conf', 'any/etc/sensors3.conf'],
     \ 'services': ['/etc/services', 'any/etc/services'],
     \ 'setserial': ['/etc/serial.conf', 'any/etc/serial.conf'],
diff --git a/src/version.c b/src/version.c
index 304a730..265cf31 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2523,
+/**/
     2522,
 /**/
     2521,