Upgrade zod dependency

[brichet]

The current version of zod (3.25.51) has an issue when building with "skipLibCheck": false is specified in tsconfig.json.

See colinhacks/zod#4545 and colinhacks/zod#4624 for more constext.

This PR fix it by upgrading the version of zod.

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[hntrl]

Out of curiosity does your package manager not automatically resolve to the same zod deps for langchain if you set the minimum requirement? I.e. if you set zod to be "^3.25.56" in your package.json does that fix your lib check errors? (I would assume it would?)

This resolutions key you're updating here won't actually impact the deps that released packages call for, it's just yarn's way of globally pinning a package version for local dev. If upgrading the dep in your package.json doesn't work we need to update the zod deps directly in each dependencies field of each package.json instead of just setting the resolutions

[brichet]

Right, this change would not impact our dependencies.
I just saw that the culprit was a pinned version in @langchain/openai, which has already been addressed in #8380.
Sorry for the noise 😄