docs: update old VITE_NODE_DEPS_MODULE_DIRECTORIES references (#9654)

Author: AriPerkkio

CONTRIBUTING.md

@@ -67,7 +67,7 @@ And re-run `pnpm install` to link the package.
 Add a `.npmrc` file with following line next to the `package.json`:
 
 ```sh
-VITE_NODE_DEPS_MODULE_DIRECTORIES=/node_modules/,/packages/
+VITEST_MODULE_DIRECTORIES=/node_modules/,/packages/
 ```
 
 ## Pull Request Guidelines

test/config/test/exec-args.test.ts

@@ -40,7 +40,7 @@ test('should not pass execArgv to workers when not specified in the config', asy
     nodeOptions: {
       cwd: `${process.cwd()}/fixtures/no-exec-args-fixtures`,
       env: {
-        VITE_NODE_DEPS_MODULE_DIRECTORIES: '/node_modules/,/packages/',
+        VITEST_MODULE_DIRECTORIES: '/node_modules/,/packages/',
         NO_COLOR: '1',
       },
     },
@@ -63,7 +63,7 @@ test('should let allowed args pass to workers', async () => {
     nodeOptions: {
       cwd: `${process.cwd()}/fixtures/allowed-exec-args-fixtures`,
       env: {
-        VITE_NODE_DEPS_MODULE_DIRECTORIES: '/node_modules/,/packages/',
+        VITEST_MODULE_DIRECTORIES: '/node_modules/,/packages/',
         NO_COLOR: '1',
       },
     },