update example dependencies

[altendky]

Address flaky tests.

https://github.com/altendky/qtrio/runs/2855606009?check_suite_focus=true#step:4:861

E               pytest.PytestUnraisableExceptionWarning: Exception ignored in: <async_generator object Auth.async_auth_flow at 0x000001C4BA7A25E0>
E               
E               Traceback (most recent call last):
E                 File "c:\hostedtoolcache\windows\python\3.8.10\x64\lib\site-packages\trio\_core\_asyncgens.py", line 79, in finalizer
E                   warnings.warn(
E               ResourceWarning: Async generator 'httpx._auth.Auth.async_auth_flow' was garbage collected before it had been exhausted. Surround its use in 'async with aclosing(...):' to ensure that it gets cleaned up as soon as you're done using it.

httpx addressed this in 0.18.2 via https://github.com/encode/httpx/commit/b43af721cd7804214396b5511e4f68d144a9b6a6?w=1#diff-905594f34b3a0c59f2fa149877415115c7362bd9652f7327186bf21c199f564fR927.

[codecov[bot]]

Codecov Report

Merging #252 (fa15cb2) into master (727ba64) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #252   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           33        33           
  Lines         1960      1960           
  Branches       128       128           
=========================================
  Hits          1960      1960           

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