chore: remove NODE_VERSION from netlify.toml to unblock preview deploys

[alessbell]

As a side effect of https://github.com/apollographql/odyssey/pull/976/files, preview deploys are currently failing (example: https://app.netlify.com/sites/apollo-client-docs/deploys/65f88d0e78880e00084cd36f, see private Slack thread here for more info.)

This PR removes the NODE_VERSION specified in netlify.toml so it can be set via Netlify GUI.

[changeset-bot]

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Latest commit: 8bc83e2

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

size-limit report 📦

Path	Size
dist/apollo-client.min.cjs	38.35 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs"	46.17 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs" (production)	43.73 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js"	33.95 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js" (production)	31.87 KB (0%)
import { ApolloProvider } from "dist/react/index.js"	1.23 KB (0%)
import { ApolloProvider } from "dist/react/index.js" (production)	1.22 KB (0%)
import { useQuery } from "dist/react/index.js"	5.26 KB (0%)
import { useQuery } from "dist/react/index.js" (production)	4.35 KB (0%)
import { useLazyQuery } from "dist/react/index.js"	5.5 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"	5.36 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js" (production)	4.03 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js"	4.83 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js" (production)	3.49 KB (0%)
import { useLoadableQuery } from "dist/react/index.js"	4.98 KB (0%)
import { useLoadableQuery } from "dist/react/index.js" (production)	3.63 KB (0%)
import { useReadQuery } from "dist/react/index.js"	3.12 KB (0%)
import { useReadQuery } from "dist/react/index.js" (production)	3.06 KB (0%)
import { useFragment } from "dist/react/index.js"	2.27 KB (0%)
import { useFragment } from "dist/react/index.js" (production)	2.22 KB (0%)