Update Astro peer dependency in adapters with auto-enabled sessions

[delucis]

Changes

• When sessions were stabilized in Astro 5.7.0 (feat: stable sessions #13527), we updated the Node, Netlify, and Cloudflare adapters to auto-enable the feature.
• However, these adapters did not update their peerDependencies version of astro, meaning it’s possible to install the latest adapter with an older version of astro and see errors because the adapter is setting sessions config which doesn’t exist.
• This PR bumps the peer dependency to 5.7.0 in the three adapters to fix this.
• Technically I’d consider this and the initial decision to auto-enable sessions a breaking change, which should have come with a major release of the adapters, but because that change was made in a minor release, I’ve made this a patch as a “fix” to the behaviour introduced in that minor release.

Testing

N/A — dependency management only

Docs

N/A

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[ematipico]

I updated the PR, so the CI should pass