chore(voucher): upgrade @apollo/server v4→v5, @as-integrations/next v3→v4

[k9ert]

Summary

Upgrades Apollo Server and its Next.js integration in apps/voucher:

• @apollo/server: ^4.7.1 → ^5.0.0 (resolved: 5.5.0)
• @as-integrations/next: ^3.1.0 → ^4.0.0 (resolved: 4.1.0)

Motivation: Apollo Server v4 is End of Life. Tracked in blinkbitcoin/blink-wip#635 (parent: blinkbitcoin/blink-wip#631).

What changed

Only apps/voucher/package.json and pnpm-lock.yaml. No source code changes required — the voucher app's usage of ApolloServer and startServerAndCreateNextHandler is fully compatible with v5.

Breaking changes reviewed (Apollo Server v4 → v5)

Full migration guide: https://www.apollographql.com/docs/apollo-server/migration/

Breaking change	Impact on voucher	Action
Node.js ≥ v20 required	Already on v20+	None
graphql.js ≥ v16.11.0 required	Currently ^16.6.0 in package.json — resolved version already satisfies this	None
Express integration extracted to @as-integrations/express4	Voucher uses Next.js integration, not Express	N/A
status400ForVariableCoercionErrors now defaults to true	Variable coercion errors now return HTTP 400 instead of 200. This is correct behavior per the GraphQL spec	None (improvement)
startStandaloneServer no longer uses Express	Not used in voucher	N/A
precomputedNonce option removed from landing page plugins	Not used	N/A
Compiled targeting ES2023	Fine for Node.js v20+	None
formatError callback	Unchanged API. Voucher's formatError in app/api/graphql/route.ts works as-is	None
Constructor API (new ApolloServer({...}))	Unchanged. typeDefs, resolvers, formatError all work identically	None
Native fetch instead of node-fetch for built-in plugins	No HTTP proxy usage in voucher	N/A

Breaking changes reviewed (@as-integrations/next v3 → v4)

Release notes: https://github.com/apollo-server-integrations/apollo-server-integration-next/releases/tag/v4.0.0

Breaking change	Impact on voucher	Action
Requires @apollo/server ≥ v5	Bumped in this PR	Done
Drops Node.js 18 support	Already on v20+	None
startServerAndCreateNextHandler API	Unchanged between v3 and v4	None

Verification

• pnpm install --filter voucher — clean install ✅
• tsc --noEmit — no Apollo-related type errors ✅ (pre-existing test type issues unrelated to this change)

Files

• apps/voucher/package.json — version bumps
• pnpm-lock.yaml — lockfile update

Closes blinkbitcoin/blink-wip#635

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Upgrades Apollo Server and the Next.js Apollo integration used by the apps/voucher application to supported (non‑EOL) major versions, updating the workspace lockfile accordingly.

Changes:

• Bump @apollo/server from v4 to v5 in apps/voucher.
• Bump @as-integrations/next from v3 to v4 in apps/voucher.
• Regenerate pnpm-lock.yaml to reflect the new dependency graph.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
apps/voucher/package.json	Updates Apollo Server and Next.js integration dependency ranges for the voucher app.
pnpm-lock.yaml	Updates resolved versions and transitive dependencies for the new Apollo packages.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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