use protobuf 4.21.8

README.md

@@ -3,7 +3,7 @@
 [![CI Status](https://github.com/scito/extract_otp_secret_keys/actions/workflows/ci.yml/badge.svg)](https://github.com/scito/extract_otp_secret_keys/actions/workflows/ci.yml)
 ![PyPI - Python Version](https://img.shields.io/pypi/pyversions/protobuf)
 [![GitHub Pipenv locked Python version](https://img.shields.io/github/pipenv/locked/python-version/scito/extract_otp_secret_keys)](https://github.com/scito/extract_otp_secret_keys/blob/master/Pipfile.lock)
-![protobuf version](https://img.shields.io/badge/protobuf-4.21.6-informational)
+![protobuf version](https://img.shields.io/badge/protobuf-4.21.8-informational)
 [![License](https://img.shields.io/github/license/scito/extract_otp_secret_keys)](https://github.com/scito/extract_otp_secret_keys/blob/master/LICENSE)
 [![GitHub tag (latest SemVer)](https://img.shields.io/github/v/tag/scito/extract_otp_secret_keys?sort=semver&label=version)](https://github.com/scito/extract_otp_secret_keys/tags)
 [![Stand With Ukraine](https://raw.githubusercontent.com/vshymanskyy/StandWithUkraine/main/badges/StandWithUkraine.svg)](https://stand-with-ukraine.pp.ua)
@@ -44,7 +44,7 @@ options:
 
 Known to work with
 
-* Python 3.10.7, protobuf 4.21.6, qrcode 7.3.1, and pillow 9.2
+* Python 3.10.7, protobuf 4.21.8, qrcode 7.3.1, and pillow 9.2
 
 For protobuf versions 3.14.0 or similar or Python 3.6, use the extract_otp_secret_keys version 1.4.0.
 
@@ -63,7 +63,7 @@ Command for regeneration of Python code from proto3 message definition file (onl
 
     protoc --python_out=protobuf_generated_python google_auth.proto
 
-The generated protobuf Python code was generated by protoc 21.6 (https://github.com/protocolbuffers/protobuf/releases/tag/v21.6).
+The generated protobuf Python code was generated by protoc 21.8 (https://github.com/protocolbuffers/protobuf/releases/tag/v21.8).
 
 ## References