fix(ci): add mkdocs-minify-plugin to dep scan allowlist

The GitHub Pages MkDocs site (PR microsoft#1186) added mkdocs-minify-plugin
to site/requirements.txt. Add it to the registered packages list
so dependency-scan passes.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: imran-siddique

scripts/check_dependency_confusion.py

@@ -75,7 +75,7 @@
     "langfuse", "arize", "arize-phoenix", "llamaindex", "braintrust", "helicone",
     "datadog", "langsmith", "wandb", "mlflow", "agentops",
     "typer", "jsonschema", "anyio", "pre-commit", "import-linter",
-    "mkdocs", "mkdocs-material", "mkdocstrings", "datasets", "sqlglot",
+    "mkdocs", "mkdocs-material", "mkdocs-minify-plugin", "mkdocstrings", "datasets", "sqlglot",
     "aio-pika", "aiokafka",
     # Cedar/OPA policy backends
     "cedarpy", "llama-index-core", "ddtrace",