fix(deps): update rust crate handlebars to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
handlebars	dependencies	major	5.1.0 -> 6.0.0

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Release Notes

sunng87/handlebars-rust (handlebars)

v6.3.2

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• [Fixed] Reimplementation of partial context [#​699]

v6.3.1

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• [Fixed] Regression of partial context [#​694]

v6.3.0

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• [Added] Builders for some non-exhaustive structs [#​688]
• [Changed] and and or helper now accepts multiple parameters [#​687]
• [Changed] MSRV is now 1.73

v6.2.0

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• [Added] @index variable for object iteration [#​682]
• [Changed] improve number comparison between different types [#​679]

v6.1.0

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• [Added] More data type support in comparison helpers [#​673]

v6.0.0

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• [Fixed] Various indent issue with partials, empty lines and helpers [#​646]
  [#​654] [#​658]
• [Fixed] Bug when accessing nested path [#​651]
• [Added] New public access to PathSeg [#​656]
• [Added] New API to set single block params in BlockContext [#​655]
• [Added] From<RenderError> for RenderErrorReason [#​644]
• [Changed] Add non_exhaustive attribute to all public memebers [#​647]
• [Changed] RenderContext API and improved performance for partial rendering
  [#​661] [#​662]
• [Changed] Improved error messsage for template parsing [#​638]

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