chore(deps-dev): bump phoenix from 1.8.13 to 1.8.15 in /mcp

[dependabot]

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Bumps phoenix from 1.8.13 to 1.8.15.

Release notes

Sourced from phoenix's releases.

v1.8.15

Bug fixes

• [phx.gen.cert] Fix certificate not being accepted by Chromium (#6847)
• [phoenix.js] Fix asynchronous transport close tearing down the replacement transport (#6852)

Enhancements

• [phx.new] Update Tailwind version to 4.3.3

v1.8.14

Bug fixes

• Fix timer leak in LongPoll fetch requests (only used in service or web workers) (#6811)

Enhancements

• Raise when :router given to use Phoenix.VerifiedRoutes is not a compile time literal (#6806)
• Align nil host handling in endpoint configuration and transport
• Unify path validation for static paths, verified routes and redirects

Changelog

Sourced from phoenix's changelog.

v1.8.15 (2026-09-25)

Bug fixes

• [phx.gen.cert] Fix certificate not being accepted by Chromium (#6847)
• [phoenix.js] Fix asynchronous transport close tearing down the replacement transport (#6852)

Enhancements

• [phx.new] Update Tailwind version to 4.3.3

v1.8.14 (2026-09-14)

Bug fixes

• Fix timer leak in LongPoll fetch requests (only used in service or web workers) (#6811)

Enhancements

• Raise when :router given to use Phoenix.VerifiedRoutes is not a compile time literal (#6806)
• Align nil host handling in endpoint configuration and transport
• Unify path validation for static paths, verified routes and redirects

Commits

• bd18018 fix version in package.json
• 762d1a1 Release v1.8.15
• f735b51 Update assets
• 405f892 Fix async close leaking to replaced transport (#6854)
• 968a940 Restore NULL parameters on phx.gen.cert's public key algorithm (#6848)
• 1d09594 Remove stale test in Socket.TransportTest (#6849)
• 04e14f1 Bump Tailwind CLI in phx.new templates to 4.3.3 (#6845)
• d676d61 Clarify potential resource exhaustion with long polling
• d344b10 docs: remove outdated problem statement from routing guide (#6841)
• 96085e9 Release v1.8.14
• Additional commits viewable in compare view

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[cursor]

Superseded by #185 (merged). Closing this Dependabot PR; the branch is left in place.

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