fix(colors): update Changed highlight to yellow in vscode theme

Change the `Changed` highlight color from dark red to yellow in the
vscode theme. The previous dark red color did not provide an optimal
visual experience, whereas yellow offers better contrast and
readability.

Author: daephx

lua/plugins/colors/vscode.lua

@@ -52,7 +52,7 @@ return {
 
         -- Git
         Added = { fg = c.vscGitAdded },
-        Changed = { fg = c.vscDiffRedDark },
+        Changed = { fg = c.vscYellow },
         Removed = { fg = c.vscRed },
 
         -- Diff