⬆️ bump braintools from 0.1.7 to 0.1.8

Bumps [braintools](https://github.com/chaobrain/braintools) from 0.1.7 to 0.1.8.
- [Release notes](https://github.com/chaobrain/braintools/releases)
- [Changelog](https://github.com/chaobrain/braintools/blob/main/changelog.md)
- [Commits](chaobrain/braintools@v0.1.7...v0.1.8)

---
updated-dependencies:
- dependency-name: braintools
  dependency-version: 0.1.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -2,7 +2,7 @@
 brainunit==0.1.3
 brainevent==0.0.5
 brainstate==0.2.9
-braintools==0.1.7
+braintools==0.1.8
 braintrace==0.1.2
 
 # modeling packages