chore: bump version to 0.4.7

The v0.4.6 tag shipped with BASE_VERSION and pyproject version still
at 0.4.5, so deployments reported 0.4.5+g<sha> and NIP-91 listings
announced the old version. Bump to 0.4.7 ahead of tagging.

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "routstr"
-version = "0.4.5"
+version = "0.4.7"
 description = "Payment proxy for your LLM endpoint using cashu and nostr."
 readme = "README.md"
 requires-python = ">=3.11"

routstr/core/version.py

@@ -20,7 +20,7 @@ import subprocess
 from functools import lru_cache
 from pathlib import Path
 
-BASE_VERSION = "0.4.5"
+BASE_VERSION = "0.4.7"
 
 _REPO_ROOT = Path(__file__).resolve().parents[2]
 _GIT_TIMEOUT_SECONDS = 2.0