dependencies.py: use Enum rather than StrEnum for DependencyKind

StrEnum is only supported in Python versions 3.11 and
newer. Gentoolkit should not require >=3.11, so DependencyKind will
use the regular Enum feature instead.

The difference between StrEnum and Enum is that StrEnum members are
strings and can generally be used in place of strings in APIs
expecting string input. Non-StrEnum members are not strings, but you
can get members values by accessing their value field (DependencyKind.DEPEND.value).

pym/gentoolkit/dependencies.py

@@ -13,7 +13,7 @@
 
 import itertools
 from functools import cache
-from enum import StrEnum
+from enum import Enum
 from typing import List, Dict
 
 import portage
@@ -28,7 +28,7 @@
 # =======
 
 
-class DependencyKind(StrEnum):
+class DependencyKind(Enum):
     DEPEND = "DEPEND"
     RDEPEND = "RDEPEND"
     BDEPEND = "BDEPEND"
@@ -104,13 +104,13 @@ def _get_depend(self, env_vars, raw=False):
 
     @cache
     def get_raw_depends(self) -> str:
-        return self._get_depend([depkind for depkind in DependencyKind], raw=True)
+        return self._get_depend([depkind.value for depkind in DependencyKind], raw=True)
 
     @cache
     def get_depends(self) -> Dict[DependencyKind, List[Atom]]:
         depends = dict()
         for depkind in DependencyKind:
-            depend = self._get_depend([depkind])
+            depend = self._get_depend([depkind.value])
             depends[depkind] = depend
         return depends