Update handlebars requirement from 5.1.2 to 6.0.0

Updates the requirements on handlebars to permit the latest version.

Changelog

Sourced from handlebars's changelog.

5.1.2 - 2024-03-24

• [Changed] Improved error message and syntax rule naming #638
• [Changed] Updated heck to 0.5 #635

5.1.1 - 2024-01-18 Yanked

• [Changed] Turned off pub access of chain in HelperTemplate

5.1.0 - 2024-01-17

• [Added] Chained else if block support #629

5.0.0 - 2023-12-31

• [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

4.3.4 - 2022-09-11

• [Added] New write_fmt function for Output #522
• [Added] reason() method for TemplateError to access underlying reason, this replaces original direct .reason access.
• [Changed] Direct access to TemplateError's reason field is depreacted will be removed in future.

4.3.3 - 2022-07-20

• [Fixed] Disable partial expression indentation with {{~> partial}} to bring behavior closer in line with original javascript version. #518
• [Fixed] Support for using partial context together with partial parameters #520

4.3.2 - 2022-07-14

• [Added] Render functions that reuse Context for custom std::io::Write: render_with_context_to_write and render_template_with_context_to_write

4.3.1 - 2022-06-09

• [Added] Added support for {{~{variable}~}} syntax #509

4.3.0 - 2022-05-18

... (truncated)

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