chore(deps): freshen dependency floors, clear pip vulns

- nostrkey >=0.1.1 -> >=0.3.4 (latest; same behavior, tests green)
- dev: pytest >=8.0 -> >=9.0, pytest-asyncio >=0.23 -> >=1.0, ruff >=0.4 -> >=0.15
  (env already resolved to these majors; 40/40 tests green, ruff clean)
- pip upgraded 25.3 -> 26.1.2 in venv, clearing 5 pip advisories

Held: cryptography 44.0.3 (4 advisories, PYSEC-2026-35/-2141, GHSA-537c-gmf6-5ccf)
remains — all fixes are >=45 but nostrkey pins cryptography<45.0; requires
upstream nostrkey to relax its ceiling. No test/behavior changes.

Author: vveerrgg

pyproject.toml

@@ -25,14 +25,14 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 dependencies = [
-    "nostrkey>=0.1.1",
+    "nostrkey>=0.3.4",
 ]
 
 [project.optional-dependencies]
 dev = [
-    "pytest>=8.0",
-    "pytest-asyncio>=0.23",
-    "ruff>=0.4",
+    "pytest>=9.0",
+    "pytest-asyncio>=1.0",
+    "ruff>=0.15",
 ]
 
 [project.urls]