Update Rust crate regex from 1.11.2 to 1.12.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
regex	dependencies	minor	1.11.2 -> 1.12.2

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Release Notes

rust-lang/regex (regex)

v1.12.2

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This release fixes a cargo doc breakage on nightly when --cfg docsrs is
enabled. This caused documentation to fail to build on docs.rs.

Bug fixes:

• BUG #​1305:
  Switches the doc_auto_cfg feature to doc_cfg on nightly for docs.rs builds.

v1.12.1

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This release makes a bug fix in the new regex::Captures::get_match API
introduced in 1.12.0. There was an oversight with the lifetime parameter
for the Match returned. This is technically a breaking change, but given
that it was caught almost immediately and I've yanked the 1.12.0 release,
I think this is fine.

v1.12.0

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This release contains a smattering of bug fixes, a fix for excessive memory
consumption in some cases and a new regex::Captures::get_match API.

Improvements:

• FEATURE #​1146:
  Add Capture::get_match for returning the overall match without unwrap().

Bug fixes:

• BUG #​1083:
  Fixes a panic in the lazy DFA (can only occur for especially large regexes).
• BUG #​1116:
  Fixes a memory usage regression for large regexes (introduced in regex 1.9).
• BUG #​1195:
  Fix universal start states in sparse DFA.
• BUG #​1295:
  Fixes a panic when deserializing a corrupted dense DFA.
• BUG 8f5d9479:
  Make regex_automata::meta::Regex::find consistently return None when
  WhichCaptures::None is used.

v1.11.3

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===================
This is a small patch release with an improvement in memory usage in some
cases.

Improvements:

• BUG #​1297:
  Improve memory usage by trimming excess memory capacity in some spots.

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