vim-patch:8.2.4414: solidity files are not recognized (#17451)

Problem:    Solidity files are not recognized.
Solution:   Add the *.sol pattern. (Dundar Goc, closes vim/vim#9792)
97b231541d

src/nvim/testdir/test_filetype.vim

@@ -478,6 +478,7 @@ let s:filename_checks = {
     \ 'skill': ['file.il', 'file.ils', 'file.cdf'],
     \ 'slang': ['file.sl'],
     \ 'slice': ['file.ice'],
+    \ 'solidity': ['file.sol'],
     \ 'solution': ['file.sln'],
     \ 'slpconf': ['/etc/slp.conf', 'any/etc/slp.conf'],
     \ 'slpreg': ['/etc/slp.reg', 'any/etc/slp.reg'],