Update ahash requirement from 0.7.6 to 0.8.0

Updates the requirements on [ahash](https://github.com/tkaitchuck/ahash) to permit the latest version.
- [Release notes](https://github.com/tkaitchuck/ahash/releases)
- [Commits](tkaitchuck/aHash@v0.7.6...v0.8.0)

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

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

Author: dependabot[bot]

gdnative-core/Cargo.toml

@@ -19,7 +19,7 @@ type-tag-fallback = []
 [dependencies]
 gdnative-sys = { path = "../gdnative-sys", version = "=0.10.0" }
 gdnative-impl-proc-macros = { path = "../impl/proc-macros", version = "=0.10.0" }
-ahash = "0.7.6"
+ahash = "0.8.0"
 approx = "0.5"
 atomic-take = "1"
 bitflags = "1"