Bumps handlebars from 4.0.11 to 4.5.3.

Sourced from handlebars's changelog.

v4.5.3 - November 18th, 2019

Bugfixes:

• fix: add "no-prototype-builtins" eslint-rule and fix all occurences - f7f05d7
• fix: add more properties required to be enumerable - 1988878

Chores / Build:

• fix: use !== 0 instead of != 0 - c02b05f
• add chai and dirty-chai and sinon, for cleaner test-assertions and spies,
  deprecate old assertion-methods - 93e284e, 886ba86, 0817dad, 93516a0

Security:

• The properties __proto__, __defineGetter__, __defineSetter__ and __lookupGetter__
  have been added to the list of "properties that must be enumerable".
  If a property by that name is found and not enumerable on its parent,
  it will silently evaluate to undefined. This is done in both the compiled template and the "lookup"-helper.
  This will prevent new Remote-Code-Execution exploits that have been
  published recently.

Compatibility notes:

• Due to the security-fixes. The semantics of the templates using
  __proto__, __defineGetter__, __defineSetter__ and __lookupGetter__ in the respect that those expression now return
  undefined rather than their actual value from the proto.
• The semantics have not changed in cases where the properties are enumerable, as in:

{
  __proto__: 'some string'
}

• The change may be breaking in that respect, but we still only
  increase the patch-version, because the incompatible use-cases
  are not intended, undocumented and far less important than fixing
  Remote-Code-Execution exploits on existing systems.

Commits

v4.5.2 - November 13th, 2019

Bugfixes

• fix: use String(field) in lookup when checking for "constructor" - d541378
• test: add fluent API for testing Handlebars - c2ac79c

Compatibility notes:

• no incompatibility are to be expected

... (truncated)

• c819c8b v4.5.3
• 827c9d0 Update release notes
• f7f05d7 fix: add "no-prototype-builtins" eslint-rule and fix all occurences
• 1988878 fix: add more properties required to be enumerable
• 886ba86 test/chore: add chai/expect and sinon to "runtime"-environment
• 0817dad test: add sinon as global variable to eslint in the specs
• 93516a0 test: add sinon.js for spies, deprecate current assertions
• 93e284e chore: add chai and dirty-chai for better test assertions
• c02b05f fix: use !== 0 instead of != 0
• 8de121d v4.5.2
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot ignore this [patch|minor|major] version will close this PR and stop Dependabot creating any more for this minor/major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language

You can disable automated security fix PRs for this repo from the Security Alerts page.