chore(deps): update msgspec requirement from ~=0.18.4 to ~=0.18.5

Updates the requirements on [msgspec](https://github.com/jcrist/msgspec) to permit the latest version.
- [Release notes](https://github.com/jcrist/msgspec/releases)
- [Commits](jcrist/msgspec@0.18.4...0.18.5)

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

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

requirements/speed.txt

@@ -1,2 +1,2 @@
-msgspec~=0.18.4
+msgspec~=0.18.5
 aiohttp[speedups]