Fix tarfile-warnings due to PEP 706

This commit addresses some warnings issued by Python 3.12+ with regards
to the behavior of `tarfile.extractall()`. Currently that method gets
called in two places: the URL and GitHub provider. Both essentially
trust the archive to not be malicious at the moment: tarfiles can be
crafted to overwrite other parts of the system and have strange links or
even device files...

[PEP 706] tries to fix this potential security vulnerability in a large
amount of code written today by restricting changing the behavior of the
aforementioned method in Python 3.14. At the moment, a warning is issued
to apply a suitable filter parameter. This commit uses such a filter, if
the python version running the code supports it.
The implementation is based on conda/conda-package-streaming#96, which
is a pull request fixing the same thing. The solution of adding the new
filter argument only if supported is elegant and backwards-compatible.

The `data`-filter was chosen, since the archives this project deals with
are typically exactly that: an archive of plain old directories with
regular files in them.

Applying this commit reduces the number of warnings reported by the test
suite from five down to zero. The previous output was:
```log
=================================================== warnings summary ===================================================
tests/test_coremanager.py::test_export
tests/test_coremanager.py::test_export
tests/test_coremanager.py::test_export
tests/test_provider.py::test_github_provider
  /home/jfrimmel/git/fusesoc/.tox/py3/lib/python3.13/site-packages/fusesoc/provider/github.py:44: DeprecationWarning: Python 3.14 will, by default, filter extracted tar archives and reject files or modify their metadata. Use the filter argument to control this behavior.
    t.extractall(cache_root)

tests/test_provider.py::test_url_provider
  /home/jfrimmel/git/fusesoc/.tox/py3/lib/python3.13/site-packages/fusesoc/provider/url.py:47: DeprecationWarning: Python 3.14 will, by default, filter extracted tar archives and reject files or modify their metadata. Use the filter argument to control this behavior.
    t.extractall(local_dir)

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
```

It's a bit unfortunate, that the same change needed to be performed in
two places, but I wanted to keep the diff as minimal as possible and did
not want to introduce a new module or similar.

[PEP 706]: https://peps.python.org/pep-0706/

fusesoc/provider/github.py

@@ -9,6 +9,8 @@
 
 from fusesoc.provider.provider import Provider
 
+_HAS_TAR_FILTER = hasattr(tarfile, "tar_filter")  # Requires Python 3.12
+
 logger = logging.getLogger(__name__)
 
 if sys.version_info[0] >= 3:
@@ -41,5 +43,10 @@ def _checkout(self, local_dir):
 
         # Ugly hack to get the first part of the directory name of the extracted files
         tmp = t.getnames()[0]
-        t.extractall(cache_root)
+
+        extraction_arguments = {"path": cache_root}
+        if _HAS_TAR_FILTER:
+            extraction_arguments["filter"] = "data"
+        t.extractall(**extraction_arguments)
+
         os.rename(os.path.join(cache_root, tmp), os.path.join(cache_root, core))

fusesoc/provider/url.py

@@ -21,6 +21,8 @@
 
 from fusesoc.provider.provider import Provider
 
+_HAS_TAR_FILTER = hasattr(tarfile, "tar_filter")  # Requires Python 3.12
+
 
 class Url(Provider):
     def _checkout(self, local_dir):
@@ -44,7 +46,10 @@ def _checkout(self, local_dir):
         filetype = self.config.get("filetype")
         if filetype == "tar":
             t = tarfile.open(filename)
-            t.extractall(local_dir)
+            extraction_arguments = {"path": local_dir}
+            if _HAS_TAR_FILTER:
+                extraction_arguments["filter"] = "data"
+            t.extractall(**extraction_arguments)
         elif filetype == "zip":
             with zipfile.ZipFile(filename, "r") as z:
                 z.extractall(local_dir)