Bump ember-cli-htmlbars from 5.6.3 to 5.6.4 (#239)

Bumps [ember-cli-htmlbars](https://github.com/ember-cli/ember-cli-htmlbars) from 5.6.3 to 5.6.4.
- [Release notes](https://github.com/ember-cli/ember-cli-htmlbars/releases)
- [Changelog](https://github.com/ember-cli/ember-cli-htmlbars/blob/master/CHANGELOG.md)
- [Commits](ember-cli/ember-cli-htmlbars@v5.6.3...v5.6.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

yarn.lock

@@ -5260,9 +5260,9 @@ ember-cli-htmlbars-inline-precompile@^2.1.0:
     silent-error "^1.1.0"
 
 ember-cli-htmlbars@^5.3.1:
-  version "5.6.3"
-  resolved "https://registry.yarnpkg.com/ember-cli-htmlbars/-/ember-cli-htmlbars-5.6.3.tgz#4916d1ea2b6d69ea5e7252c0c59e56d7031ee310"
-  integrity sha512-pn2pW49KmsrjlG4PEMmd3ZrsbS2WHKn+1NLLCWUjxmc5g4/lHxHicB8IN5z95ANmgqDHAwp+rw1XTyWy9r0xyQ==
+  version "5.6.4"
+  resolved "https://registry.yarnpkg.com/ember-cli-htmlbars/-/ember-cli-htmlbars-5.6.4.tgz#97c1ce813dfe79961c575b4516fbb30cbb782b43"
+  integrity sha512-I4zSc6PJpWiDuhru7jozQsodo4tAsNENJP/Ry0LTL0DtlZASEa5cwahPsxBjzEmAnr30oI2AExZhrDcZBryTjQ==
   dependencies:
     "@ember/edition-utils" "^1.2.0"
     babel-plugin-htmlbars-inline-precompile "^4.4.1"