fix memory leak in utils/jinja.py

[sakateka]

The SaltCacheLoader class was leaking through an external module atexit.
atexit.register has an internal list where it adds finalizers at each call,
LazyLoader at each re-import of jinja modules,
imported into them utils/jinja.py and thereby called atexit.register'. Since atexit` is executed at the end of the process life, it is better to
let the operating system terminate all connections and free up all resources.

What does this PR do?

fix memory leak

What issues does this PR fix or reference?

Fixes:
may be #61988

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

Commits signed with GPG?

Yes

Please review Salt's Contributing Guide for best practices.

See GitHub's page on GPG signing for more information about signing commits with GPG.

[sakateka]

@s0undt3ch
Hi, this is a very simple patch, can you help merge it?
After this patch and #62006 #62021, memory consumption on my master servers is very stable.

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Detected Issues (click me)

Check Known Missing Docstrings...........................................Failed
- hook id: invoke
- duration: 1.31s
- exit code: 1
/home/runner/.cache/pre-commit/repoz5fct3ox/py_env-python3/lib/python3.9/site-packages/_distutils_hack/init.py:30: UserWarning: Setuptools is replacing distutils.

warnings.warn("Setuptools is replacing distutils.")

The function 'jinja_raise' on 'salt/utils/jinja.py' does not have a docstring

The function 'regex_escape' on 'salt/utils/jinja.py' does not have a docstring

The function 'method_call' on 'salt/utils/jinja.py' does not have a docstring

The function 'show_full_context' on 'salt/utils/jinja.py' does not have a docstring

Found 4 errors

---

Thanks again!