ApolloProvider: ensure context value stability

[phryneas]

This fixes #7626

Checklist:

• If this PR contains changes to the library itself (not necessary for e.g. docs updates), please include a changeset (see CONTRIBUTING.md)
• If this PR is a new feature, please reference an issue where a consensus about the design was reached (not necessary for small changes)
• Make sure all of the significant new logic is covered by tests

[changeset-bot]

🦋 Changeset detected

Latest commit: 247419b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@apollo/client	Patch

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[jerelmiller]

Had a couple minor suggestions that I think could simplify this a tad more. Feel free to take it or leave it. Thanks for getting this updated!

[github-actions]

size-limit report 📦

Path	Size
dist/apollo-client.min.cjs	35.8 KB (+0.01% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs"	45.26 KB (+0.02% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js"	34.05 KB (0%)
import { ApolloProvider } from "dist/react/index.js"	871 B (+0.47% 🔺)
import { useQuery } from "dist/react/index.js"	4.35 KB (0%)
import { useLazyQuery } from "dist/react/index.js"	4.66 KB (0%)
import { useMutation } from "dist/react/index.js"	2.52 KB (0%)
import { useSubscription } from "dist/react/index.js"	2.36 KB (0%)
import { useSuspenseQuery_experimental } from "dist/react/index.js"	3.53 KB (0%)
import { useBackgroundQuery_experimental } from "dist/react/index.js"	2.97 KB (0%)
import { useReadQuery_experimental } from "dist/react/index.js"	1.12 KB (0%)
import { useFragment_experimental } from "dist/react/index.js"	1.78 KB (0%)