vim-patch:9.0.1565: json lines files are not recognized (#23677)

Problem:    Json lines files are not recognized.
Solution:   Add a pattern to detect "jsonl" files. (issue vim/vim#7520)

6fadbc1e8c

Co-authored-by: Bram Moolenaar <Bram@vim.org>

runtime/lua/vim/filetype.lua

@@ -579,6 +579,7 @@ local extension = {
   ['json-patch'] = 'json',
   json5 = 'json5',
   jsonc = 'jsonc',
+  jsonl = 'jsonl',
   jsonnet = 'jsonnet',
   libsonnet = 'jsonnet',
   jsp = 'jsp',