Update dependency ember-source to v5.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-source (source)	5.5.0 -> 5.6.0

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Release Notes

emberjs/ember.js (ember-source)

v5.6.0

Compare Source

• #​20595 [BUGFIX] An addon re-export should always be a JavaScript file
• #​20603 [BUGFIX] Internal templates should be strictMode
• #​20605 [BUGFIX] Move babel-plugin-ember-template-compilation to dependencies
• #​20570 [CLEANUP] Remove all traces of named outlets code

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