Bump attrs from 20.3.0 to 21.2.0

Bumps [attrs](https://github.com/python-attrs/attrs) from 20.3.0 to 21.2.0.
- [Release notes](https://github.com/python-attrs/attrs/releases)
- [Changelog](https://github.com/python-attrs/attrs/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/python-attrs/attrs/compare/20.3.0...21.2.0)

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

automated_detection_testing/requirements.txt

@@ -4,7 +4,7 @@ apipkg==1.5
 aspy.yaml==1.3.0
 atomicwrites==1.4.0
 attackcti==0.3.4.3
-attrs==20.3.0
+attrs==21.2.0
 azure-common==1.1.25
 azure-core==1.13.0
 azure-identity==1.6.0
@@ -45,7 +45,7 @@ path.py==12.5.0
 pexpect==4.8.0
 pluggy==0.13.1
 pre-commit==2.12.1
-protobuf==3.15.6
+protobuf==3.17.0
 psutil==5.8.0
 ptyprocess==0.7.0
 py==1.10.0

requirements.txt

@@ -2,7 +2,7 @@ antlr4-python3-runtime==4.9.2
 appdirs==1.4.4
 aspy.yaml==1.3.0
 attackcti==0.3.4.3
-attrs==20.3.0
+attrs==21.2.0
 CacheControl==0.12.6
 certifi==2020.12.5
 cfgv==3.2.0