Update hashbrown requirement from 0.14.3 to 0.15.1

Updates the requirements on [hashbrown](https://github.com/rust-lang/hashbrown) to permit the latest version.
- [Changelog](https://github.com/rust-lang/hashbrown/blob/master/CHANGELOG.md)
- [Commits](rust-lang/hashbrown@v0.14.3...v0.15.1)

---
updated-dependencies:
- dependency-name: hashbrown
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -21,7 +21,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
 bitvec = "1.0.1"
-hashbrown = "0.14.3"
+hashbrown = "0.15.1"
 rand = "0.8.5"
 venndb-macros = { version = "0.5.0", path = "venndb-macros" }