fix: incompatibility with eslint-plugin-jsx-a11y

[wopss]

As described in #466 the plugin is not compatible when using both eslint-plugin-astro and eslint-plugin-jsx-a11y because of the redefinition of jsx-a11y plugin. This PR resolves the issue by renaming the jsx-a11y plugin defined by eslint-plugin-astro to astro/jsx-a11y.

The only concern I have is regarding:

eslint-plugin-astro/src/a11y/configs.ts

Line 59 in 054461d

plugins: ["jsx-a11y"],

I believe it should be changed to astro, but since my tests did not show any error, I left it unchanged for now.

I have tested this change in a small repository with both ESLint 9.35.0 and 8.57.1, and everything appears to be working correctly.

Fixes #466.

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[wopss]

Regarding the CHANGELOG: I am not sure if this is a breaking change, since this change only updates the defined plugin name to what it should be. As far as I understand ESLint, this redefinition should not affect any written rules.