Revert "deps: deprecate python3.8 and python3.9 (#138)"

[airkei]

Why

In X2 system, medeia streaming ECU still uses python3.8.
https://github.com/tier4/pilot-auto.x2/blob/beta/v4.3/ansible/playbooks/vars/x2_media_streaming.yaml#L27-#L28

What

Revert #138

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
src/otaclient_iot_logging_server
__init__.py	3	0	100%
__main__.py	19	1	94%	52
_common.py	19	0	100%
_log_setting.py	26	10	61%	63, 65–66, 68–69, 73–74, 77–78, 80
_sd_notify.py	32	8	75%	41, 51, 56–58, 64–66
_utils.py	50	2	96%	73, 137
_version.py	13	0	100%
aws_iot_logger.py	84	40	52%	70–72, 74–75, 78, 81–82, 85, 89–92, 96–98, 101–103, 106–111, 126, 132–134, 136–140, 144, 191, 198–201
boto3_session.py	91	35	61%	66, 74–75, 77, 92–93, 97, 99, 107, 148, 160, 190–191, 193–195, 197–199, 201, 208–210, 212–213, 215, 219, 221–222, 224–226, 228, 257–258
config_file_monitor.py	43	6	86%	63–65, 82–84
configs.py	45	1	97%	73
ecu_info.py	36	1	97%	74
greengrass_config.py	100	5	95%	154, 272–275
log_proxy_server.py	48	29	39%	46–47, 49–51, 54–56, 59–60, 64, 67, 69–70, 73, 76, 80–82, 84–85, 89–90, 97–98, 100–101, 106, 112
servicer.py	58	5	91%	59, 101–103, 119
src/otaclient_iot_logging_server/v1
_types.py	42	0	100%
api_stub.py	14	0	100%
TOTAL	723	143	80%

Tests	Skipped	Failures	Errors	Time
61	0 💤	0 ❌	0 🔥	19.080s ⏱️

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
67.6% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[airkei]

As this package will be installed only in main ECU, we don't have to support legacy python.