Update Rust crate rnix to 0.12.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rnix	dependencies	minor	0.10.1 -> 0.12.0

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Release Notes

nix-community/rnix-parser (rnix)

v0.12.0

• Add support for pipe operators

v0.11.0

Compare Source

• removes the types module and replaces it with ast

• the ast modules has better types and sum types

• removes ParsedType in favor of Expr

• removes the value module. methods on Value go on the individual types. For example, string related methods go on ast::Str

• parse changed to Root::parse

• NODE_OR_DEFAULT is removed

• NODE_KEY -> NODE_ATTRPATH, NODE_KEY_VALUE -> NODE_ATTRPATH_VALUE

• BinOp::IsSet is removed since it's actually not a normal binary operator.

• NODE_SELECT is flattened in favor of NODE_ATTRPATH which consists of multiple Attrs, including a.b.c and a.b.c or expr

• a or b is Apply, not "OrDefault", which matches the result of Nix. Fixes #​23

• ${ is considered invalid at Expr places now, which matches the result of Nix.

• remove TOKEN_DYNAMIC_START and TOKEN_DYNAMIC_END

• rowan 15.0

• various other parsing fixes

v0.10.2

Compare Source

• Correctly parse every possible case of path-interpolation in Nix code (#​85).

  (from @​ncfavier).

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