ci: test the dependency floors on Python 3.15 (#198)

Author: lesnik512

.github/workflows/_checks.yml

@@ -69,6 +69,8 @@ jobs:
           - "3.13"
           - "3.14"
           - "3.14t"
+          - "3.15"
+          - "3.15t"
     steps:
       - uses: actions/checkout@v6
       - uses: astral-sh/setup-uv@v8.2.0

pyproject.toml

@@ -35,26 +35,30 @@ classifiers = [
 version = "0"
 dependencies = [
     "httpx2>=2.0.0,<3.0",
-    # 4.14.0 is the first whose closed TypedDicts keep their keys on Python 3.14, and the
-    # cp314 pydantic floor (2.12) needs 4.14.1.
-    "typing-extensions>=4.14.1",
+    # 4.14.0 is the first whose closed TypedDicts keep their keys on Python 3.14, the cp314
+    # pydantic floor (2.12) needs 4.14.1 and the cp315 one (2.14) needs 4.16.0.
+    "typing-extensions>=4.14.1; python_version < '3.15'",
+    "typing-extensions>=4.16.0; python_version >= '3.15'",
 ]
 
 [project.optional-dependencies]
 pydantic = [
-    # pydantic-core ships no cp312 wheel before pydantic 2.1, no cp313 wheel before 2.8.1 and no
-    # cp314 wheel before 2.12.
+    # pydantic-core ships no cp312 wheel before pydantic 2.1, no cp313 wheel before 2.8.1, no
+    # cp314 wheel before 2.12 and no cp315 wheel before 2.14.
     "pydantic>=2.0,<3.0; python_version < '3.12'",
     "pydantic>=2.1,<3.0; python_version == '3.12'",
     "pydantic>=2.8.1,<3.0; python_version == '3.13'",
-    "pydantic>=2.12,<3.0; python_version >= '3.14'",
+    "pydantic>=2.12,<3.0; python_version == '3.14'",
+    "pydantic>=2.14,<3.0; python_version >= '3.15'",
 ]
 msgspec = [
     # 0.18.5 is the first release whose can_decode agrees with decode on Annotated types;
-    # 0.19 is the first with a cp313 wheel and 0.20 the first with a cp314 one.
+    # 0.19 is the first with a cp313 wheel, 0.20 the first with a cp314 one and 0.22 the first
+    # with a cp315 one.
     "msgspec>=0.18.5; python_version < '3.13'",
     "msgspec>=0.19; python_version == '3.13'",
-    "msgspec>=0.20; python_version >= '3.14'",
+    "msgspec>=0.20; python_version == '3.14'",
+    "msgspec>=0.22; python_version >= '3.15'",
 ]
 otel = ["opentelemetry-api>=1.20"]
 all = ["httpware[pydantic,msgspec,otel]"]