vim-patch:9.1.0950: filetype: fennelrc files are not recognized

Problem:  filetype: fennelrc files are not recognized
Solution: detect 'fennelrc' files as fennel filetype
          (Wu Zhenyu)

References:
https://github.com/bakpakin/Fennel/issues/193

closes: vim/vim#16262

f173f4249f

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

runtime/lua/vim/filetype.lua

@@ -1544,6 +1544,8 @@ local filename = {
   ['filter-rules'] = 'elmfilt',
   ['exim.conf'] = 'exim',
   exports = 'exports',
+  fennelrc = 'fennel',
+  ['.fennelrc'] = 'fennel',
   ['.fetchmailrc'] = 'fetchmail',
   fvSchemes = detect.foam,
   fvSolution = detect.foam,