chore: use Node.js v20 in GitHub Actions workflows

[alessbell]

v20 became LTS in October 2023, this PR updates all our GHA workflows to use it.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 723147c

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	37.04 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs"	43.5 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs" (production)	41.99 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js"	32.53 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js" (production)	31.22 KB (0%)
import { ApolloProvider } from "dist/react/index.js"	1.22 KB (0%)
import { ApolloProvider } from "dist/react/index.js" (production)	1.2 KB (0%)
import { useQuery } from "dist/react/index.js"	4.27 KB (0%)
import { useQuery } from "dist/react/index.js" (production)	4.08 KB (0%)
import { useLazyQuery } from "dist/react/index.js"	4.58 KB (0%)
import { useLazyQuery } from "dist/react/index.js" (production)	4.39 KB (0%)
import { useMutation } from "dist/react/index.js"	2.55 KB (0%)
import { useMutation } from "dist/react/index.js" (production)	2.53 KB (0%)
import { useSubscription } from "dist/react/index.js"	2.23 KB (0%)
import { useSubscription } from "dist/react/index.js" (production)	2.19 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js"	4.61 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js" (production)	4.05 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js"	4.13 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js" (production)	3.55 KB (0%)
import { useReadQuery } from "dist/react/index.js"	2.99 KB (0%)
import { useReadQuery } from "dist/react/index.js" (production)	2.93 KB (0%)
import { useFragment } from "dist/react/index.js"	2.17 KB (0%)
import { useFragment } from "dist/react/index.js" (production)	2.11 KB (0%)

[jerelmiller]

Thank you!