vim-patch:9.1.0248: filetype: yarn lock files are not recognized

Problem:  filetype: yarn lock files are not recognized
Solution: Detect 'yarn.lock' files as yaml
          (Wu, Zhenyu)

closes: vim/vim#14369

3b497aa247

Co-authored-by: Wu, Zhenyu <wuzhenyu@ustc.edu>

runtime/lua/vim/filetype.lua

@@ -1570,6 +1570,7 @@ local filename = {
   ['.clangd'] = 'yaml',
   ['.clang-format'] = 'yaml',
   ['.clang-tidy'] = 'yaml',
+  ['yarn.lock'] = 'yaml',
   ['/etc/zprofile'] = 'zsh',
   ['.zlogin'] = 'zsh',
   ['.zlogout'] = 'zsh',