build(deps): bump joblib from 0.14.0 to 1.2.0 in /riotbuild

Bumps [joblib](https://github.com/joblib/joblib) from 0.14.0 to 1.2.0.
- [Release notes](https://github.com/joblib/joblib/releases)
- [Changelog](https://github.com/joblib/joblib/blob/master/CHANGES.rst)
- [Commits](joblib/joblib@0.14.0...1.2.0)

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

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

riotbuild/requirements.txt

@@ -12,7 +12,7 @@ cryptography==3.3.2
 scapy>=2.4.3
 protobuf==3.18.3
 scikit-learn==0.22.1
-joblib==0.14.0
+joblib==1.2.0
 emlearn==0.10.1
 jinja2==2.11.3
 riotctrl[rapidjson]>=0.4.0