pynfs: Fix the xdrlib dependency for Debian

When running "make pynfs" in the current directory, I get to the
"Install pynfs build dependencies" task, which fails with the
message "No package matching 'python3-standard-xdrlib' is
available". The test system is running Debian 11.

Python 3.13 removed xdrlib (PEP 594), and we recently adjusted
install-deps/redhat/main.yml to accommodate that.

I found that the xdrlib module is already part of Python 3.9's
standard library on Debian 11. The package python3-standard-xdrlib
doesn't exist on Debian 11 because xdrlib is included by default.

Remove the python3-standard-xdrlib package and adopt the solution
used by install-deps/redhat/main.yml, which is to pull in xdrlib3
when xdrlib is not included in the standard Python library (this
should be only on Debian 13).

Signed-off-by: Chuck Lever <[email protected]>

Author: chucklever

playbooks/roles/pynfs/tasks/install-deps/debian/main.yml

@@ -1,7 +1,7 @@
 ---
 - name: Install pynfs build dependencies
   become: true
-  become_method: sudo
+  become_method: ansible.builtin.sudo
   ansible.builtin.apt:
     name:
       - gcc
@@ -13,7 +13,18 @@
       - swig
       - python3-gssapi
       - python3-ply
-      - python3-standard-xdrlib
     state: present
     update_cache: true
   tags: ["pynfs", "deps"]
+
+# xdrlib was removed from Python 3.13; Debian packages it as python3-mda-xdrlib
+- name: Install xdrlib from Debian package on Debian 13+
+  become: true
+  become_method: ansible.builtin.sudo
+  ansible.builtin.apt:
+    name:
+      - python3-mda-xdrlib
+    state: present
+  tags: ["pynfs", "deps"]
+  when:
+    - ansible_distribution_major_version | int >= 13