Changed json.schemas.url for devcontainers

[Master-Guy]

Changed json.schemas.url for devcontainers to absolute path to resolve a warning in VSCode when working with devcontainers as documented.

https://discord.com/channels/330944238910963714/554842238073700352/1327207976423002245

Proposed change

When using VSCode and devcontainers, VSCode shows a warning regarding the manifest not existing:

This change gives the devcontainer an absolute path to work with, so this warning is no longer shown.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

Please see the Discord chats about this issue here:
https://discord.com/channels/330944238910963714/554842238073700352/1327207976423002245

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[home-assistant]

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