Bump regex from 1.3.1 to 1.4.6

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Bumps regex from 1.3.1 to 1.4.6.

Changelog

Sourced from regex's changelog.

1.4.6 (2021-04-22)

This is a small patch release that fixes the compiler's size check on how much heap memory a regex uses. Previously, the compiler did not account for the heap usage of Unicode character classes. Now it does. It's possible that this may make some regexes fail to compile that previously did compile. If that happens, please file an issue.

• BUG OSS-fuzz#33579: Some regexes can use more heap memory than one would expect.

1.4.5 (2021-03-14)

This is a small patch release that fixes a regression in the size of a Regex in the 1.4.4 release. Prior to 1.4.4, a Regex was 552 bytes. In the 1.4.4 release, it was 856 bytes due to internal changes. In this release, a Regex is now 16 bytes. In general, the size of a Regex was never something that was on my radar, but this increased size in the 1.4.4 release seems to have crossed a threshold and resulted in stack overflows in some programs.

• [BUG #750](rust-lang/regex#750): Fixes stack overflows seemingly caused by a large Regex size by decreasing its size.

1.4.4 (2021-03-11)

This is a small patch release that contains some bug fixes. Notably, it also drops the thread_local (and lazy_static, via transitivity) dependencies.

Bug fixes:

• [BUG #362](rust-lang/regex#362): Memory leaks caused by an internal caching strategy should now be fixed.
• [BUG #576](rust-lang/regex#576): All regex types now implement UnwindSafe and RefUnwindSafe.
• [BUG #728](rust-lang/regex#749): Add missing Replacer impls for Vec<u8>, String, Cow, etc.

1.4.3 (2021-01-08)

This is a small patch release that adds some missing standard trait implementations for some types in the public API.

Bug fixes:

• [BUG #734](rust-lang/regex#734): Add FusedIterator and ExactSizeIterator impls to iterator types.

... (truncated)

Commits

• 3db8722 1.4.6
• 41f14c2 fuzz: account for Unicode class size in compiler
• 6d95a6f impl: shrink size of Inst
• cc0f2c9 fuzz: update libfuzzer dependency
• ff283ba 1.4.5
• 78c7cef impl: substantially reduce regex stack size
• 951b8b9 1.4.4
• 5a35701 regex-syntax-0.6.23
• 967a090 changelog: 1.4.4
• e040c1b impl: drop thread_local dependency
• Additional commits viewable in compare view

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