refactor: use PEP 695 type keyword for type aliases

Replace typing.TypeAlias annotations with the Python 3.12 type
statement (PEP 695) in build commands and resolver modules. This
was flagged by ruff UP040 after bumping target-version to py312.

Co-Authored-By: Claude <claude@anthropic.com>
Signed-off-by: Shanmukh Pawan <smoparth@redhat.com>

Author: smoparth

src/fromager/commands/build.py

@@ -58,10 +58,8 @@ def dict_factory(x: list[tuple[str, typing.Any]]) -> dict[str, typing.Any]:
         }
 
 
-BuildSequenceEntryFuture: typing.TypeAlias = concurrent.futures.Future[
-    BuildSequenceEntry
-]
-DependencyNodeSet: typing.TypeAlias = set[dependency_graph.DependencyNode]
+type BuildSequenceEntryFuture = concurrent.futures.Future[BuildSequenceEntry]
+type DependencyNodeSet = set[dependency_graph.DependencyNode]
 
 
 @click.command()

src/fromager/resolver.py

@@ -369,14 +369,12 @@ def get_project_from_pypi(
         logger.info("ignored all candidate files at %s", sdist_server_url)
 
 
-RequirementsMap: typing.TypeAlias = typing.Mapping[str, typing.Iterable[Requirement]]
-Candidates: typing.TypeAlias = typing.Iterable[Candidate]
-CandidatesMap: typing.TypeAlias = typing.Mapping[str, Candidates]
+type RequirementsMap = typing.Mapping[str, typing.Iterable[Requirement]]
+type Candidates = typing.Iterable[Candidate]
+type CandidatesMap = typing.Mapping[str, Candidates]
 # {identifier: [cls, cachekey]: list[candidates]}}
-ResolverCache: typing.TypeAlias = dict[
-    str, dict[tuple[type[ExtrasProvider], str], list[Candidate]]
-]
-VersionSource: typing.TypeAlias = typing.Callable[
+type ResolverCache = dict[str, dict[tuple[type[ExtrasProvider], str], list[Candidate]]]
+type VersionSource = typing.Callable[
     [str],
     typing.Iterable[Candidate | tuple[str, str | Version]],
 ]