deps: update rust crate handlebars to v6.4.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
handlebars	dependencies	patch	6.4.0 → 6.4.2

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Release Notes

sunng87/handlebars-rust (handlebars)

v6.4.2

Compare Source

• [Fixed] Access to local variables like @key, @index, etc. in #with and
  partial block [#​758]
• [Fixed] Preserve ordering when iterating an array context inside a partial
  that receives hash parameters [#​760]
• [Changed] Enable serde_json preserve_order feature. JSON objects are now
  iterated in insertion order (matching Handlebars.js semantics) instead of
  alphabetical key order. This fixes index-key ordering for array contexts
  converted into objects by partial hash parameters (e.g. "10" no longer
  sorts before "2").

v6.4.1

Compare Source

• [Fixed] Allow using @partial-block with block include and fallback template [#​752]

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Quality Gate passed

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