chore(deps): update rust crate regex to v1.12.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
regex	workspace.dependencies	patch	1.12.1 -> 1.12.2

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Release Notes

rust-lang/regex (regex)

v1.12.2

Compare Source

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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.

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