Update Rust crate minijinja to v0.20.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
minijinja	dependencies	minor	=0.19.1 -> =0.20.0

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Release Notes

mitsuhiko/minijinja

v0.20.0

Compare Source

• Remove internal refcounts from environment.
• Changed Object and FunctionArgs interface to take
  arguments by reference. (#​101)
• sync mode is now always enabled. (#​104)
• Removed meta API. (#​105)
• Error no longer implements PartialEq.
• Simplified the function interface. Filters, tests and global
  functions can now directly return values instead of results. (#​107)
• MiniJinja no longer silently iterates over non iterable values.

Breaking Changes

• The meta API is gone without replacement.
• Object::call_method and Object::call now take the arguments
  as &[Value] instead of Vec<Value>.
• Object::call_method, Object::call and FunctionArgs::from_values
  now take the arguments as &[Value] instead of Vec<Value>.
• The error object used to implement PartialEq but this was implemented
  by comparing the error kind instead. Explicitly use the .kind()
  method of the error if you want the same behavior.
• DebugInfo is no longer exposed. This might come back if a better
  API can be found.

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