temporarily fix the urllib3 2.0.0 incompatible with openssl (#2662)

The error is
```
ImportError: urllib3 v2.0 only supports OpenSSL 1.1.1+, currently the 'ssl' 
module is compiled with OpenSSL 1.0.2k-fips  26 Jan 2017. See: 
urllib3/urllib3#2168
```

urllib3 release 2.0.0 today and dropped support for openssl < 1.1.1,
whereas out centos7 bundled openssl library is 1.0.2k.

This restraints could be dropped when our image base has been switch to
ubuntu #2607

coordinator/requirements.txt

@@ -16,3 +16,4 @@ prometheus-client>=0.14.1
 setuptools==65.7.0
 packaging
 tqdm
+urllib3>=1.24.2,<2.0.0