[pip] Update aiostream requirement from ~=0.6.3 to ~=0.6.4 (#91)

Updates the requirements on [aiostream](https://github.com/vxgmichel/aiostream) to permit the latest version.
- [Release notes](https://github.com/vxgmichel/aiostream/releases)
- [Commits](vxgmichel/aiostream@v0.6.3...v0.6.4)

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

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requirements.txt

@@ -1,5 +1,5 @@
 aiomqtt~=2.3.0
-aiostream~=0.6.3
+aiostream~=0.6.4
 async-gpib~=2.1.3
 beanie~=1.26.0
 gpib-ctypes>=0.3.0