fix(api): bump pyserial dependency in setup.py

[mcous]

Overview

The pyserial dependency was bumped to 3.5 (in the Pipfile and Builroot) in the v4.1.0 release, but setup.py still specifies 3.4, which means the package thinks it needs 3.4.

This PR fixes setup.py so the opentrons package knows what version of pyserial it actually wants.

Changelog

• fix(api): bump pyserial dependency in setup.py

Review requests

Pretty self explanatory

Risk assessment

Bugfix

[codecov]

Codecov Report

Merging #7250 (e6cfd3d) into chore_release-4.1.1 (a50f900) will increase coverage by 0.04%.
The diff coverage is n/a.

@@                   Coverage Diff                   @@
##           chore_release-4.1.1    #7250      +/-   ##
=======================================================
+ Coverage                79.11%   79.16%   +0.04%     
=======================================================
  Files                      289      265      -24     
  Lines                    20218    19161    -1057     
=======================================================
- Hits                     15995    15168     -827     
+ Misses                    4223     3993     -230     

Impacted Files	Coverage Δ
opentrons/protocol_engine/state/motion.py	100.00% <0.00%> (ø)
opentrons/protocol_engine/commands/aspirate.py	100.00% <0.00%> (ø)
opentrons/protocol_engine/execution/pipetting.py	100.00% <0.00%> (ø)
...trons/protocol_engine/commands/pipetting_common.py	100.00% <0.00%> (ø)
...otify-server/notify_server/models/sample_events.py
update-server/otupdate/buildroot/__init__.py
update-server/otupdate/buildroot/update.py
.../notify_server/models/hardware_event/door_state.py
...erver/notify_server/models/hardware_event/names.py
update-server/otupdate/buildroot/file_actions.py
... and 19 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a50f900...e6cfd3d. Read the comment docs.

[sfoster1]

LGTM, matches buildroot