Bump sniffio from 1.1.0 to 1.2.0

Bumps [sniffio](https://github.com/python-trio/sniffio) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/python-trio/sniffio/releases)
- [Commits](python-trio/sniffio@v1.1.0...v1.2.0)

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

Author: dependabot-preview[bot]

docs-requirements.txt

@@ -25,7 +25,7 @@ pyparsing==2.4.7          # via packaging
 pytz==2020.1              # via babel
 requests==2.24.0          # via sphinx
 six==1.15.0               # via packaging
-sniffio==1.1.0            # via -r docs-requirements.in
+sniffio==1.2.0            # via -r docs-requirements.in
 snowballstemmer==2.0.0    # via sphinx
 sortedcontainers==2.2.2   # via -r docs-requirements.in
 sphinx-rtd-theme==0.5.0   # via -r docs-requirements.in

test-requirements.txt

@@ -49,7 +49,7 @@ pytest-cov==2.10.1        # via -r test-requirements.in
 pytest==6.1.1             # via -r test-requirements.in, pytest-cov
 regex==2020.10.11         # via black
 six==1.15.0               # via astroid, cryptography, packaging, pyopenssl
-sniffio==1.1.0            # via -r test-requirements.in
+sniffio==1.2.0            # via -r test-requirements.in
 sortedcontainers==2.2.2   # via -r test-requirements.in
 toml==0.10.1              # via black, pylint, pytest
 traitlets==5.0.4          # via ipython