Update dependency ember-source to v6.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-source (source)	6.3.0 -> 6.4.0

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Release Notes

emberjs/ember.js (ember-source)

v6.4.0

Compare Source

• #​20842 [BREAKING] Drop support for TypeScript 4.9 to allow for glimmer-vm upgrade.
  • Ember now tests against TypeScript 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7.
    Per the rolling support window, following Semantic Versioning for TypeScript Types,
    the supported range of TypeScript versions across two Ember LTS releases must
    always overlap.
    For more examples, see the Stability heading in this blog post.
  • We now require consumers use verbatimModuleSyntax.
• #​20842 / #​20864 Upgrade glimmer-vm.
• #​20872 [BUGFIX] Fix {{debugger}} via upgrade @​glimmer/runtime.
• #​20850 [BUGFIX] Fix source maps in published packages.
• #​20867 [BUGFIX] Fix LOG_VERSIONS.
• #​20852 [CLEANUP] Remove ember-auto-import as a dependency.
• #​20863 [CLEANUP] Cleanup "octane edition" code
• #​20856 [DOCS] Restore @​glimmer/component API docs and test against classes and modules generated in api docs to prevent future missing docs.

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