fix(nextjs): Use globalThis instead of global in edge runtime (#9612)

Co-authored-by: Luca Forstner <[email protected]>

Author: 非凡少年

packages/nextjs/src/config/loaders/valueInjectionLoader.ts

@@ -19,7 +19,8 @@ export default function valueInjectionLoader(this: LoaderThis<LoaderOptions>, us
   this.cacheable(false);
 
   // Define some global proxy that works on server and on the browser.
-  let injectedCode = 'var _sentryCollisionFreeGlobalObject = typeof window === "undefined" ? global : window;\n';
+  let injectedCode =
+    'var _sentryCollisionFreeGlobalObject = typeof window != "undefined" ? window : typeof global != "undefined" ? global : typeof self != "undefined" ? self : {};\n';
 
   Object.entries(values).forEach(([key, value]) => {
     injectedCode += `_sentryCollisionFreeGlobalObject["${key}"] = ${JSON.stringify(value)};\n`;