chore(python): drop py3.7 support (apache#1981)

## What does this PR do?

This pr drop py3.7 support

## Related issues

Closes apache#1982 

## Does this PR introduce any user-facing change?

<!--
If any user-facing interface changes, please [open an
issue](https://github.com/apache/fury/issues/new/choose) describing the
need to do so and update the document if necessary.
-->

- [ ] Does this PR introduce any public API change?
- [ ] Does this PR introduce any binary protocol compatibility change?

## Benchmark

<!--
When the PR has an impact on performance (if you don't know whether the
PR will have an impact on performance, you can submit the PR first, and
if it will have impact on performance, the code reviewer will explain
it), be sure to attach a benchmark data here.
-->

.github/workflows/ci.yml

@@ -218,7 +218,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: [3.7, 3.12]
+        python-version: [3.8, 3.12]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}

.github/workflows/release.yaml

@@ -32,7 +32,7 @@ jobs:
       url: https://pypi.org/project/pyfury
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, 3.10.12, 3.11, 3.12]
+        python-version: [3.8, 3.9, 3.10.12, 3.11, 3.12]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}

python/pyfury/_fury.py

@@ -21,7 +21,6 @@
 import enum
 import logging
 import os
-import sys
 import warnings
 from dataclasses import dataclass
 from typing import Dict, Tuple, TypeVar, Union, Iterable
@@ -80,10 +79,7 @@
 
 from cloudpickle import Pickler
 
-if sys.version_info[:2] < (3, 8):  # pragma: no cover
-    from pickle5 import Unpickler
-else:
-    from pickle import Unpickler
+from pickle import Unpickler
 
 logger = logging.getLogger(__name__)
 

python/pyfury/_serialization.pyx

@@ -59,10 +59,7 @@ try:
 except ImportError:
     np = None
 
-if sys.version_info[:2] < (3, 8):  # pragma: no cover
-    import pickle5 as pickle  # nosec  # pylint: disable=import_pickle
-else:
-    import pickle  # nosec  # pylint: disable=import_pickle
+import pickle  # nosec  # pylint: disable=import_pickle
 
 cimport cython
 

python/setup.py

@@ -159,8 +159,6 @@ def parse_version():
     ],
     zip_safe=False,
     install_requires=[
-        'dataclasses; python_version<"3.7"',
-        'pickle5; python_version<"3.8"',
         "cloudpickle",
     ],
     extras_require={