Issue 81598
Summary A module with python version 3.7 is used, but the minimum required python version is 3.6
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Reporter songdongsheng
    Testing fails in RHEL 8:

```
stderr:
Traceback (most recent call last):
  File "/opt/llvm-build/llvm-18.x/libcxx/test/libcxx/module_std.gen.py", line 24, in <module>
    from libcxx.test.modules import module_test_generator
  File "/opt/llvm-build/llvm-18.x/rc2/llvm-project/libcxx/utils/libcxx/test/modules.py", line 11, in <module>
    from dataclasses import dataclass
ModuleNotFoundError: No module named 'dataclasses'
```
This is because the default python in RHEL 8 is 3.6, and this test uses the new modules in python 3.7.

The easiest fix is to upgrade the python version requirement to 3.7 or higher and modify the page [Getting Started with the LLVM System](https://llvm.org/docs/GettingStarted.html).

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