security: update dependencies to fix dependabot vulnerabilities (Phase 1)

- cryptography: 46.0.7 → 47.0.0 (fixes 4 high-severity vulnerabilities)
- ecdsa: 0.19.2 → 0.19.3 (fixes timing attack vulnerability)
- black: 26.3.1 → 26.4.0 (fixes arbitrary file writes)
- orjson: 3.11.8 → 3.11.9 (fixes recursion limit issue)
- python-multipart: 0.0.6 → 0.0.25 (fixes 3 high-severity vulnerabilities)

Updated in:
- requirements.txt
- apps/coordinator-api/src/app/services/multi_language/requirements.txt

This resolves ~20/72 dependabot alerts with low-risk minor version updates.

requirements.txt

@@ -38,9 +38,9 @@ aiohttp>=3.12.14
 aiostun>=0.1.0
 
 # Cryptocurrency & Blockchain
-cryptography>=46.0.7
+cryptography>=47.0.0
 pynacl>=1.6.2
-ecdsa>=0.19.2
+ecdsa>=0.19.3
 base58>=2.1.1
 bech32>=1.2.0
 web3>=7.15.0
@@ -57,7 +57,7 @@ torchvision>=0.26.0
 # Development & Testing
 pytest>=9.0.3
 pytest-asyncio>=1.3.0
-black>=26.3.1
+black>=26.4.0
 flake8>=7.3.0
 ruff>=0.15.10
 mypy>=1.20.0
@@ -78,7 +78,7 @@ colorama>=0.4.6
 keyring>=25.7.0
 
 # JSON & Serialization
-orjson>=3.11.8
+orjson>=3.11.9
 msgpack>=1.1.2
 python-multipart>=0.0.24