Change PyInfo cache versioning mechanism

This reverts some changes introduced in pypa#2809

src/virtualenv/app_data/via_disk_folder.py

@@ -79,7 +79,7 @@ def extract(self, path, to_folder):
 
     @property
     def py_info_at(self):
-        return self.lock / "py_info" / "1"
+        return self.lock / "py_info" / "2"
 
     def py_info(self, path):
         return PyInfoStoreDisk(self.py_info_at, path)

src/virtualenv/discovery/cached_py_info.py

@@ -24,7 +24,6 @@
 _CACHE = OrderedDict()
 _CACHE[Path(sys.executable)] = PythonInfo()
 LOGGER = logging.getLogger(__name__)
-_CACHE_FILE_VERSION = 1
 
 
 def from_exe(cls, app_data, exe, env=None, raise_on_error=True, ignore_cache=False):  # noqa: FBT002, PLR0913
@@ -65,13 +64,8 @@ def _get_via_file_cache(cls, app_data, path, exe, env):
     with py_info_store.locked():
         if py_info_store.exists():  # if exists and matches load
             data = py_info_store.read()
-            of_path, of_st_mtime, of_content, version = (
-                data["path"],
-                data["st_mtime"],
-                data["content"],
-                data.get("version"),
-            )
-            if of_path == path_text and of_st_mtime == path_modified and version == _CACHE_FILE_VERSION:
+            of_path, of_st_mtime, of_content = data["path"], data["st_mtime"], data["content"]
+            if of_path == path_text and of_st_mtime == path_modified:
                 py_info = cls._from_dict(of_content.copy())
                 sys_exe = py_info.system_executable
                 if sys_exe is not None and not os.path.exists(sys_exe):
@@ -86,7 +80,6 @@ def _get_via_file_cache(cls, app_data, path, exe, env):
                     "st_mtime": path_modified,
                     "path": path_text,
                     "content": py_info._to_dict(),  # noqa: SLF001
-                    "version": _CACHE_FILE_VERSION,
                 }
                 py_info_store.write(data)
             else: