Drop python39 support

[jjaakola-aiven]

About this change - What it does

References: #xxxxx

Why this way

[github-actions]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
src/karapace
client.py
karapace.py
messaging.py					108
rapu.py
serialization.py
typing.py
src/karapace/avro_dataclasses
introspect.py
models.py
src/karapace/backup
api.py
src/karapace/backup/backends/v3
backend.py
src/karapace/compatibility/jsonschema
utils.py
src/karapace/kafka
common.py
consumer.py
src/karapace/kafka_rest_apis
__init__.py
schema_cache.py
src/karapace/protobuf
compare_type_storage.py					61-62
io.py
option_reader.py
proto_file_element.py
proto_parser.py
proto_type.py
syntax_reader.py
src/karapace/sentry
sentry_client_api.py
src/schema_registry
factory.py					5, 20
src/schema_registry/middlewares
__init__.py					6
Project Total

The report is truncated to 25 files out of 35. To see the full report, please visit the workflow summary page.

This report was generated by python-coverage-comment-action

[nosahama]

Thank you 🚀