Bump applemusic, zotero, nextcloud MCP servers to latest

- applemusic-mcp: 0.15.1 -> 0.18.3 (adds keyring dep)
- zotero-mcp: 0.5.0 -> 0.9.1 (pyzotero 1.13.5, vendored pdf-inspector,
  updated dep set per pyproject)
- nextcloud-mcp-server: 0.121.3 -> 0.173.0 (adds anyio, uvicorn,
  cryptography, lxml, botocore, numpy, packaging, pypdfium2; updated
  postPatch for new uv_build/icalendar constraints)

All hashes computed via nix build on wilkes; nix flake check passes.

packages/applemusic-mcp/package.nix

@@ -6,14 +6,14 @@
 
 python3Packages.buildPythonApplication rec {
   pname = "applemusic-mcp";
-  version = "0.15.1";
+  version = "0.18.3";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "epheterson";
     repo = "applemusic-mcp";
     rev = "v${version}";
-    hash = "sha256-N97bZyT8TWOrt1WS7W31OJaICwoUxFfcDDuRs+TweTQ=";
+    hash = "sha256-VHW7ct824hW+Gv3x6tMDGnvx3Hj/0ZDqGjc7yQOaf7U=";
   };
 
   build-system = with python3Packages; [
@@ -26,6 +26,7 @@ python3Packages.buildPythonApplication rec {
     requests
     cryptography
     playwright
+    keyring
   ];
 
   pythonImportsCheck = [ "applemusic_mcp" ];