fix: handle windows relative path handling

On Windows, when a folder is on a virtual drive (e.g. `subst X: C:/dev`),
then symlink resolving will end up causing the root of the project
and the imported files to be on separate drives.

This leads into a situations where `path.relative(root, entryFile)` does
not return a relative path.

Updates vitejs#4635

packages/vite/src/node/optimizer/esbuildDepPlugin.ts

@@ -157,7 +157,10 @@ export function esbuildDepPlugin(
         if (
           !relativePath.startsWith('./') &&
           !relativePath.startsWith('../') &&
-          relativePath !== '.'
+          relativePath !== '.' &&
+          // Windows: when root and entryFile are on different drives, then
+          // getting relative path is not possible.
+          !path.isAbsolute(relativePath)
         ) {
           relativePath = `./${relativePath}`
         }