Remove support for Python 3.8

Summary

Removed support for Python 3.8 and removed 3.8 tests from pipeline
https://gitlab.indiscale.com/caosdb/customers/f-fit/management/-/issues/106

Test Environment

Does the pipeline run successfully?

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• All automated tests pass
• Reference related issues
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• Appropriate user and developer documentation (or not necessary)
• Annotations in code (Gitlab comments)

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
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src/caosadvancedtools/models/data_model.py

@@ -23,11 +23,6 @@
 # ** end header
 #
 from copy import deepcopy
-# TODO(fspreck) for backwards compatibility with Python < 3.9 but this is
-# actually
-# [deprecated](https://docs.python.org/3/library/typing.html#typing.List), so
-# remove this, when we drop support for old Python versions.
-from typing import List
 
 import linkahead as db
 import linkahead.common.models as models
@@ -85,7 +80,7 @@ class DataModel(dict):
     def append(self, entity: db.Entity):
         self[entity.name] = entity
 
-    def extend(self, entities: List[db.Entity]):
+    def extend(self, entities: list[db.Entity]):
         for entity in entities:
             self.append(entity)