Fix type of SchemaReporter.pollTimer (#7769)

Fixes #7768

Author: cwikla

.changeset/late-donuts-think.md

@@ -0,0 +1,5 @@
+---
+'@apollo/server': patch
+---
+
+Change SchemaReporter.pollTimer from being a NodeJS.Timer to a NodeJS.Timeout

packages/server/src/plugin/schemaReporting/schemaReporter.ts

@@ -40,7 +40,7 @@ export class SchemaReporter {
  private readonly fetcher: Fetcher;
 
  private isStopped: boolean;
- private pollTimer?: NodeJS.Timer;
+ private pollTimer?: NodeJS.Timeout;
  private readonly headers: Record<string, string>;
 
  constructor(options: {