[CI/Build] add python-json-logger to requirements-common (#12842)

examples/other/logging_configuration.md

@@ -49,7 +49,8 @@ disabled, an error will occur while starting vLLM.
 ### Example 1: Customize vLLM root logger
 
 For this example, we will customize the vLLM root logger to use
-[`python-json-logger`](https://github.com/madzak/python-json-logger) to log to
+[`python-json-logger`](https://github.com/nhairs/python-json-logger)
+(which is part of the container image) to log to
 STDOUT of the console in JSON format with a log level of `INFO`.
 
 To begin, first, create an appropriate JSON logging configuration file:
@@ -82,12 +83,6 @@ To begin, first, create an appropriate JSON logging configuration file:
 }
 ```
 
-Next, install the `python-json-logger` package if it's not already installed:
-
-```bash
-pip install python-json-logger
-```
-
 Finally, run vLLM with the `VLLM_LOGGING_CONFIG_PATH` environment variable set
 to the path of the custom logging configuration JSON file: