fix(deps): update nextjs monorepo to v15.5.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
eslint-config-next (source)	15.5.5 -> 15.5.6
next (source)	15.5.5 -> 15.5.6

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Release Notes

vercel/next.js (eslint-config-next)

v15.5.6

Compare Source

vercel/next.js (next)

v15.5.6

Compare Source

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Apollo Federation Subgraph Compatibility Results

Federation 1 Support	Federation 2 Support
_service 🟢 @key (single) 🟢 @key (multi) 🟢 @key (composite) 🟢 repeatable @key 🟢 @requires 🟢 @provides 🟢 federated tracing 🟢	@link 🟢 @shareable 🟢 @tag 🟢 @override 🟢 @inaccessible 🟢 @composeDirective 🟢 @interfaceObject 🟢

Learn more:

• Apollo Federation Subgraph Specification
• Compatibility Tests

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