fix: workflow pnpm version conflict

[wackerow]

Description

• Canonical pnpm version is declared using packageManager field inside package.json
• Workflows attempt to re-declare a pnpm version, which is conflicting with canonical version noted in package.json causing an error
• PR removes re-declaration of pnpm version from each workflow

Related Issue

Fixes:

Error: Multiple versions of pnpm specified: - version 10 in the GitHub Action config with the key "version" - version pnpm@10.12.4 in the package.json with the key "packageManager" Remove one of these versions to avoid version mismatch errors like ERR_PNPM_BAD_PM_VERSION

https://github.com/ethereum/ethereum-org-website/actions/runs/19112202062
https://github.com/ethereum/ethereum-org-website/actions/runs/19174577161
https://github.com/ethereum/ethereum-org-website/actions/runs/19174593316

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