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',

test/old/testdir/test_filetype.vim

@@ -932,7 +932,7 @@ func s:GetFilenameChecks() abort
     \ 'xslt': ['file.xsl', 'file.xslt'],
     \ 'yacc': ['file.yy', 'file.yxx', 'file.y++'],
     \ 'yaml': ['file.yaml', 'file.yml', 'file.eyaml', 'file.kyaml', 'file.kyml', 'any/.bundle/config', '.clangd', '.clang-format', '.clang-tidy', 'file.mplstyle', 'matplotlibrc', 'yarn.lock',
-    \          '/home/user/.kube/config', '/home/user/.kube/kuberc', '.condarc', 'condarc', 'pixi.lock'],
+    \          '/home/user/.kube/config', '/home/user/.kube/kuberc', '.condarc', 'condarc', '.mambarc', 'mambarc', 'pixi.lock'],
     \ 'yang': ['file.yang'],
     \ 'yuck': ['file.yuck'],
     \ 'z8a': ['file.z8a'],