Bump combine from 4.6.4 to 4.6.6

[dependabot[bot]]

Bumps combine from 4.6.4 to 4.6.6.

Changelog

Sourced from combine's changelog.

v4.6.6 (2022-08-09)

• memchr: use non deprecated feature std instead of use_std

• refactor: Extract less-generic code from sequence's add_errors (-5%)

Commits

• cbc33e7 (cargo-release) version 4.6.6
• 2d308d7 (cargo-release) version 4.6.5
• 75c57c2 Updated changelog
• d3fbc80 Merge pull request #348 from klensy/memchr-dep-std
• 1e4bfd4 memchr: use non deprecated feature std instead of use_std
• 62330f5 Merge pull request #351 from Marwes/codegen
• 5ff32f1 refactor: Extract less-generic code from sequence's add_errors (-5%)
• c4e7275 Merge pull request #350 from Marwes/fix_ci
• 1166216 chore: Update CI to assume github actions
• 6de4b29 chore: Actually use nightly/beta rust on ci
• Additional commits viewable in compare view

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