chore: bump memmap2 from 0.2.3 to 0.4.0 (#20031)

* chore: bump memmap2 from 0.2.3 to 0.4.0

Bumps [memmap2](https://github.com/RazrFalcon/memmap2-rs) from 0.2.3 to 0.4.0.
- [Release notes](https://github.com/RazrFalcon/memmap2-rs/releases)
- [Changelog](https://github.com/RazrFalcon/memmap2-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/RazrFalcon/memmap2-rs/compare/v0.2.3...v0.4.0)

---
updated-dependencies:
- dependency-name: memmap2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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* [auto-commit] Update all Cargo lock files

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bucket_map/Cargo.toml

@@ -14,7 +14,7 @@ edition = "2018"
 rayon = "1.5.0"
 solana-logger = { path = "../logger", version = "=1.8.0" }
 solana-sdk = { path = "../sdk", version = "=1.8.0" }
-memmap2 = "0.2.3"
+memmap2 = "0.4.0"
 log = { version = "0.4.11" }
 solana-measure = { path = "../measure", version = "=1.8.0" }
 rand = "0.7.0"