Bump lameenc from 1.7.0 to 1.8.1

Bumps [lameenc](https://github.com/chrisstaite/lameenc) from 1.7.0 to 1.8.1.
- [Release notes](https://github.com/chrisstaite/lameenc/releases)
- [Commits](chrisstaite/lameenc@v1.7.0...v1.8.1)

---
updated-dependencies:
- dependency-name: lameenc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -12,7 +12,7 @@ google-api-python-client==2.156.0
 gunicorn==22.0.0
 h2==4.1.0
 kombu==5.3.7
-lameenc==1.7.0
+lameenc==1.8.1
 nnabla==1.30.0
 numba==0.56.4
 numpy==1.23.5