vim-patch:9.1.1775: filetype: Mamba configuration files are not recognized #35829

Problem:  filetype: Mamba configuration files are not recognized
Solution: Detect .mambarc and mambarc as yaml filetype (Samuel Huang).

References:
- https://mamba.readthedocs.io/en/latest/user_guide/configuration.html

closes: vim/vim#18338

21a21eafec

runtime/lua/vim/filetype.lua

@@ -1953,6 +1953,8 @@ local filename = {
   matplotlibrc = 'yaml',
   ['.condarc'] = 'yaml',
   condarc = 'yaml',
+  ['.mambarc'] = 'yaml',
+  mambarc = 'yaml',
   zathurarc = 'zathurarc',
   ['/etc/zprofile'] = 'zsh',
   ['.zlogin'] = 'zsh',