build(deps): bump packaging from 21.0 to 21.3 in /requirements

Bumps [packaging](https://github.com/pypa/packaging) from 21.0 to 21.3.
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/main/CHANGELOG.rst)
- [Commits](pypa/packaging@21.0...21.3)

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

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

requirements/requirements-ci.txt

@@ -433,7 +433,7 @@ opentracing==2.3.0
     #   flask-opentracing
     #   jaeger-client
     #   requests-opentracing
-packaging==21.0
+packaging==21.3
     # via
     #   -r requirements-dev.txt
     #   bleach

requirements/requirements-dev.txt

@@ -390,7 +390,7 @@ opentracing==2.3.0
     #   flask-opentracing
     #   jaeger-client
     #   requests-opentracing
-packaging==21.0
+packaging==21.3
     # via
     #   -r requirements.txt
     #   bleach

requirements/requirements-docs.txt

@@ -27,7 +27,7 @@ jinja2==3.0.3
     # via sphinx
 markupsafe==2.0.1
     # via jinja2
-packaging==21.0
+packaging==21.3
     # via sphinx
 pygments==2.7.4
     # via sphinx

requirements/requirements.txt

@@ -204,7 +204,7 @@ opentracing==2.3.0
     #   flask-opentracing
     #   jaeger-client
     #   requests-opentracing
-packaging==21.0
+packaging==21.3
     # via -r requirements.in
 parsimonious==0.8.1
     # via eth-abi