add return type to `withinDOM` implementation

[phryneas]

I am locally getting this error:

The inferred type of 'withinDOM' cannot be named without a reference to '@testing-library/dom/node_modules/pretty-format'. This is likely not portable. A type annotation is necessary.ts(2742)

So adding that annotation to fix it - I don't believe we need a Changeset for this, as it's purely internal :)

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: c051531dcb0fac4cbac2d7c8cda79b567cf7a95e

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[github-actions[bot]]

size-limit report 📦

Path	Size
dist/apollo-client.min.cjs	38.61 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs"	46.49 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs" (production)	44.04 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js"	34.16 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js" (production)	32.04 KB (0%)
import { ApolloProvider } from "dist/react/index.js"	1.24 KB (0%)
import { ApolloProvider } from "dist/react/index.js" (production)	1.22 KB (0%)
import { useQuery } from "dist/react/index.js"	5.27 KB (0%)
import { useQuery } from "dist/react/index.js" (production)	4.35 KB (0%)
import { useLazyQuery } from "dist/react/index.js"	5.51 KB (0%)
import { useLazyQuery } from "dist/react/index.js" (production)	4.58 KB (0%)
import { useMutation } from "dist/react/index.js"	3.51 KB (0%)
import { useMutation } from "dist/react/index.js" (production)	2.73 KB (0%)
import { useSubscription } from "dist/react/index.js"	3.19 KB (0%)
import { useSubscription } from "dist/react/index.js" (production)	2.38 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js"	5.44 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js" (production)	4.11 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js"	4.92 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js" (production)	3.58 KB (0%)
import { useLoadableQuery } from "dist/react/index.js"	5.03 KB (0%)
import { useLoadableQuery } from "dist/react/index.js" (production)	3.69 KB (0%)
import { useReadQuery } from "dist/react/index.js"	3.32 KB (0%)
import { useReadQuery } from "dist/react/index.js" (production)	3.26 KB (0%)
import { useFragment } from "dist/react/index.js"	2.29 KB (0%)
import { useFragment } from "dist/react/index.js" (production)	2.24 KB (0%)

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