Update Rust crate minijinja to 0.31

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
minijinja	dependencies	minor	0.30 -> 0.31

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Release Notes

mitsuhiko/minijinja

v0.31.0

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• Changed the closure behavior of macros to match the one of Jinja2. (#​233)
• Value::from_serializable will no longer panic on invalid values. Instead
  the error is deferred to runtime which makes working with objects possible
  that are only partially valid for the runtime environment. (#​234)

v0.30.7

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• Added testutils module. (#​221)
• Make it more obvious that serde flatten sometimes does not work. (#​223)
• Added configurable "undefined" value behavior. (#​227)
• Make render!() reuse the hidden environment.

v0.30.6

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• Resolve bad closure being generated for do blocks. (#​219)
• Add support for float number values in scientific notation. (#​220)

v0.30.5

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• Small performance improvements for when preserve_order is used by
  passing known capacities to the constructor.
• Minor performance improvements to the VM by giving the stack an initial
  capacity.
• Change the internal representation of spans to use u32 rather than
  usize for line and column offsets as a small speed improvement during
  compilation.
• Performance improvements for the key interning.
• Disabled key_interning by default.
• Renamed features multi-template to multi_template and
  adjacent-loop-items to adjacent_loop_items. The old feature names will
  hang around until 1.x as legacy aliases.

v0.30.4

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• Restore compilation on 32bit targets. (#​207)

v0.30.3

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• Added the Jinja2 tests ==, !=, <, <=, >, >= and in for the
  use with select and reject. (#​205)
• String rendering now uses fewer reallocations by setting an initial
  capacity based on the complexity of the template. (#​206)

v0.30.2

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• Fixed Python bindings not allowing to access dict keys prefixed with an
  underscore. (#​197)
• Added min, max and sort filters. (#​199)

v0.30.1

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• Changed add_global to perform Into<Value> implicitly.
• Added source_mut to retrieve a mutable reference to the source.
• Improved Python bindings by adding support for template reloading, better
  documentation, error reporting.
• Added pass_state to the Python binding.

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