fix: Ignore async exceptions when reading source files fails (#1501)

This fixes a subtle bug where async exceptions thrown in `addPrePostContext()` where not caught by the try/catch block.

packages/node/src/parsers.ts

@@ -140,7 +140,7 @@ export async function parseStack(stack: stacktrace.StackFrame[]): Promise<StackF
   });
 
   try {
-    return addPrePostContext(filesToRead, frames);
+    return await addPrePostContext(filesToRead, frames);
   } catch (_) {
     // This happens in electron for example where we are not able to read files from asar.
     // So it's fine, we recover be just returning all frames without pre/post context.