Update Rust crate tera to v2

[renovate]

This PR contains the following updates:

Package	Type	Change
tera (source)	dependencies	1.20.1 → 2.0.0

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Release Notes

Keats/tera (tera)

v2.4.0

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• Add implicit parameters for components
• Add Tera::render_component_with_implicits and Tera::render_component_with_implicits_to to render a component with implicit parameters as a separate context.
• Fix bug in unique filter treating distinct maps as the same
• Fix some deserializing issues with Value

v2.3.0

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• Add State::{escape,autoescaping_enabled,escape_if_needed}
• Add StringInput to use for input/parameters that is safety aware and use it for built-in filters: this
  means you should need less | safe and that string safety is passed around correctly. Safety is dropped by
  filters where the changes depend on the content itself (truncate can cut anywhere) and preserved when they specify exactly what changes (trim, replace).
• Add escape filter that is safety aware (it will not escape an already safe string) and uses the current instance
  escape function
• Escaping included templates is now done base on where it's included rather than the included template itself:
  for example a .txt included in a .html will now be autoescaped if Tera autoescapes on .html.
• Fix double escape of filter/set blocks

v2.2.0

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• Do not reserialize existing Value when serializing to a Value
• Error on content in children templates that would have been ignored
• Allows blocks inside if/elif/else again like in v1
• Allows the indentation character of the indent filter to be configured
• Add chained filter sections

v2.1.1

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• Fix component default value not allowing negative numbers
• Fix component default value not checking whether default value matches expected type

v2.1.0

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• Add .iter() method to Kwargs
• Add Tera::contains_component and Tera::get_component_names

v2.0.0

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see migration guide for all the changes.

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