fix: Security upgrade grpcio from 1.54.2 to 1.54.3 (#310)

<p>This PR was automatically created by Snyk using the credentials of a
real user.</p><br /><h3>Snyk has created this PR to fix one or more
vulnerable packages in the `pip` dependencies of this project.</h3>



#### Changes included in this PR

- Changes to the following files to upgrade the vulnerable dependencies
to a fixed version:
    - runtime/requirements.txt



#### Vulnerabilities that will be fixed





##### By pinning:
Severity | Priority Score (*) | Issue | Upgrade | Breaking Change |
Exploit Maturity

:-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------|:-------------------------
![high
severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/h.png
"high severity") | **661/1000** <br/> **Why?** Recently disclosed, Has a
fix available, CVSS 7.5 | Excessive Iteration
<br/>[SNYK-PYTHON-GRPCIO-5834443](https://snyk.io/vuln/SNYK-PYTHON-GRPCIO-5834443)
| `grpcio:` <br> `1.54.2 -> 1.54.3` <br> | No | No Known Exploit

(*) Note that the real score may have changed since the PR was raised.




Some vulnerabilities couldn't be fully fixed and so Snyk will still find
them when the project is tested again. This may be because the
vulnerability existed within more than one direct dependency, but not
all of the affected dependencies could be upgraded.


Check the changes in this PR to ensure they won't cause issues with your
project.



------------



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[//]: #
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runtime/requirements.txt

@@ -1,6 +1,6 @@
 appdirs==1.4.4
 baron==0.10.1
-grpcio==1.54.2
+grpcio==1.54.3
 grpcio-health-checking==1.54.2
 grpcio-reflection==1.54.2
 protobuf==4.23.0