fix(deps): update rust crate handlebars to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
handlebars	dependencies	major	4.5 -> 5.1

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Release Notes

sunng87/handlebars-rust (handlebars)

v5.1.0

Compare Source

• [Added] Chained else if block support [#​629]

v5.0.0

Compare Source

• [Added] public mutable access to local variables in BlockContext [#​533]
• [Changed] Simplified lifetime specifiers for Helper, ScopedJson and some
  other related types and functions. [#​532]
• [Changed] Updated TemplateError to reduce its size. Direct field access is
  removed in favor of access methods
• [Changed] Introducing RenderErrorReason for typed render error
• [Changed] Changed register_template_directory api for more customizations
  #[610]
• [Changed] Updated rust-embed to 8.0

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[backwardspy]

closing in favour of #137

[renovate]

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