[AIRFLOW-6158] Upgrade sendgrid dependency

[ms32035]

Make sure you have checked all steps below.

Jira

• My PR addresses the following Airflow Jira issues and references them in the PR title. For example, "[AIRFLOW-XXX] My Airflow PR"
  • https://issues.apache.org/jira/browse/AIRFLOW-6158

Description

• Here are some details about my PR, including screenshots of any UI changes:

Update Airflow code to support Sendgrid client 6.0 / Sendgrid API v3

Tests

• Existing tests modified

Commits

• My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• In case of new functionality, my PR adds documentation that describes how to use it.
  • All the public functions and the classes in the PR contain docstrings that explain what it does
  • If you implement backwards incompatible changes, please leave a note in the Updating.md so we can assign it to a appropriate release

[codecov-io]

Codecov Report

Merging #6719 into master will decrease coverage by 0.31%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #6719      +/-   ##
==========================================
- Coverage   83.83%   83.52%   -0.32%     
==========================================
  Files         668      668              
  Lines       37569    37565       -4     
==========================================
- Hits        31497    31376     -121     
- Misses       6072     6189     +117

Impacted Files	Coverage Δ
airflow/contrib/utils/sendgrid.py	87.03% <66.66%> (-0.9%)	⬇️
airflow/kubernetes/volume_mount.py	44.44% <0%> (-55.56%)	⬇️
airflow/kubernetes/volume.py	52.94% <0%> (-47.06%)	⬇️
airflow/kubernetes/pod_launcher.py	45.25% <0%> (-46.72%)	⬇️
airflow/kubernetes/refresh_config.py	50.98% <0%> (-23.53%)	⬇️
...rflow/contrib/operators/kubernetes_pod_operator.py	78.2% <0%> (-20.52%)	⬇️
airflow/configuration.py	89.13% <0%> (-3.63%)	⬇️
airflow/utils/dag_processing.py	58.48% <0%> (+0.49%)	⬆️

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