Update memmap2 requirement from 0.5 to 0.6

[dependabot[bot]]

Updates the requirements on memmap2 to permit the latest version.

Changelog

Sourced from memmap2's changelog.

[0.6.1] - 2023-05-10

Added

• Add MmapOptions::map_raw_read_only to avoid intermediate invalid Mmap instances. @​adamreichold

[0.6.0] - 2023-05-09

Changed

• lock() and unlock methods require &self and not &mut self now. @​timvisee

[0.5.10] - 2023-02-22

Added

• MmapOptions::map_anon accounts for populate on Linux now. @​jsgf

[0.5.9] - 2023-02-17

Added

• From<Mmap> for MmapRaw and From<MmapMut> for MmapRaw. @​swlynch99
• Mmap::advise_range, MmapMut::advise_range, MmapRaw::advise_range. @​ho-229

[0.5.8] - 2022-11-09

Added

• MmapRaw::advise, MmapRaw::lock and MmapRaw::unlock. @​diwic
• Improve MmapMut::make_exec documentation.

[0.5.7] - 2022-08-15

Changed

• Simplify file size retrieving code. @​saethlin

[0.5.6] - 2022-08-11

Added

• Memory locking and unlocking. See Mmap::lock, Mmap::unlock, MmapMut::lock and MmapMut::unlock. @​vmx

[0.5.5] - 2022-07-09

Fixed

• Limit mapping length to isize::MAX to prevent undefined behavior on calling std::slice::from_raw_parts. Technically affects only 32-bit systems. @​adamreichold

[0.5.4] - 2022-06-04

Added

• Add madvice operations specific to Darwin. @​turbocool3r
• Implement common traits for the Advice enum. @​nyurik

... (truncated)

Commits

• d00be88 Version bump.
• f62a3cb Add MmapOptions::map_raw_read_only to avoid intermediate invalid Mmap instances.
• 0220b23 Version bump.
• bd52d2c Make lock and unlock &self.
• 9970820 Fix MSRV check.
• 732df20 Correct documentation spelling.
• 17f0128 Version bump.
• b26573b Implement .populate() for map_anon().
• e281d1f Version bump.
• f348008 Add advise_range for unix.
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@3802c9c). Click here to learn what that means. Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #304 +/- ## ========================================= Coverage ? 97.96% ========================================= Files ? 31 Lines ? 12189 Branches ? 0 ========================================= Hits ? 11941 Misses ? 248 Partials ? 0 ```

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