ci: add parameterized package to FreeBSD CI dependencies

The FreeBSD CI was failing because the parameterized Python package was not
installed, but the new tests in AlignmentFilePileup_test.py require it for
the @parameterized_class decorator.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: nh13

.cirrus.yml

@@ -6,6 +6,7 @@ freebsd_ci_task:
 
   install_script: |
     pkg install -y bcftools gmake py311-cython3 py311-mypy py311-pytest samtools
+    pip install parameterized
 
   env:
     CC: "clang -isystem /usr/local/include"