chore(mcp): bump GitHub MCP server pin to 1.5.0

Author: rldyourmnd

config/mcp-runtime-versions.env

@@ -6,7 +6,7 @@ NODE_MAJOR_VERSION=24
 BUN_VERSION=1.3.14
 DART_SDK_VERSION=3.12.0
 CODEX_CLI_VERSION=0.142.3
-GITHUB_MCP_SERVER_VERSION=1.4.0
+GITHUB_MCP_SERVER_VERSION=1.5.0
 MCP_PYTHON_SDK_VERSION=1.28.1
 SERENA_AGENT_VERSION=1.5.3
 SEQUENTIAL_THINKING_MCP_VERSION=2025.12.18