change '/c' to '/C' on windows

plugin/asyncrun.vim

@@ -3,7 +3,7 @@
 " Maintainer: skywind3000 (at) gmail.com, 2016-2024
 " Homepage: https://github.com/skywind3000/asyncrun.vim
 "
-" Last Modified: 2024/05/22 00:41
+" Last Modified: 2024/05/22 00:55
 "
 " Run shell command in background and output to quickfix:
 "     :AsyncRun[!] [options] {cmd} ...
@@ -758,7 +758,7 @@ function! s:AsyncRun_Job_Start(cmd)
 			let l:args += [a:cmd]
 		else
 			let l:tmp = s:ScriptWrite(a:cmd, 0)
-			let l:args = ['cmd.exe', '/c']
+			let l:args = ['cmd.exe', '/C']
 			if s:async_nvim == 0
 				let l:args += [l:tmp]
 			elseif has('nvim-0.9.0')
@@ -2308,7 +2308,7 @@ endfunc
 " asyncrun - version
 "----------------------------------------------------------------------
 function! asyncrun#version()
-	return '2.12.7'
+	return '2.12.8'
 endfunc