build(deps): bump regex-syntax from 0.7.5 to 0.8.1

[dependabot[bot]]

Bumps regex-syntax from 0.7.5 to 0.8.1.

Commits

• b99cff0 regex-syntax-0.8.1
• f082244 syntax: revert interval set optimizations
• d5144b2 syntax: add regression tests for new bugs in internal set ops
• 6ec0a00 regex-lite-0.1.3
• f5b8cb4 lite: fix doctests on 32-bit
• dd04a57 regex-automata-0.4.1
• a2a1986 automata: fix sparse DFA state validation in no-std
• 452bc32 regex-lite-0.1.2
• f01f71b lite: add \ to the syntax docs
• 951eebd regex-cli-0.1.1
• Additional commits viewable in compare view

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