Turn into ESM only module

[nikku]

Proposed Changes

• Housekeeping (DEPS bumps)
• Turn into ES only module
• Consume from Node >= 20.12 in CommonJS modules
• Migrate to chai@6
• Update to min-dash@5
• Update to saxen@11.0.2

Checklist

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[Copilot]

Pull request overview

This pull request converts moddle-xml from a dual CommonJS/ESM module to an ESM-only module, updates dependencies to their latest versions, and modernizes the build configuration and CI workflow.

Changes:

• Converted to ESM-only module by removing CommonJS distribution
• Updated dependencies: min-dash@5, saxen@11.0.2, chai@6, mocha@11, eslint@9, and other dev dependencies
• Modified rollup configuration to output only ESM format and use ESM import syntax
• Updated CI workflow to use Node 24 and newer GitHub Actions versions

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
package.json	Updated build script with --bundleConfigAsCjs flag, simplified exports to single ESM entry point, and bumped all dependencies to latest versions
rollup.config.js	Converted to ESM syntax using import statement, removed CommonJS output configuration
test/integration/distro.cjs	Added ESM import test and simplified to use direct package imports
test/expect.js	Changed to use named import from chai instead of default import
CHANGELOG.md	Documented v12.0.0 breaking changes and dependency updates
.github/workflows/CI.yml	Updated to Node 24 and newer GitHub Actions versions
package-lock.json	Updated with new dependency versions

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