[stable-2.15] ansible-test - Fix Alpine libexpat bootstrapping (#82897)

(cherry picked from commit ca168eb367)

changelogs/fragments/ansible-test-alpine-libexpat.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - ansible-test - The ``libexpat`` package is automatically upgraded during remote bootstrapping to maintain compatibility with newer Python packages.

test/lib/ansible_test/_util/target/setup/bootstrap.sh

@@ -111,6 +111,15 @@ bootstrap_remote_alpine()
         echo "Failed to install packages. Sleeping before trying again..."
         sleep 10
     done
+
+    # Upgrade the `libexpat` package to ensure that an upgraded Python (`pyexpat`) continues to work.
+    while true; do
+        # shellcheck disable=SC2086
+        apk upgrade -q libexpat \
+        && break
+        echo "Failed to upgrade libexpat. Sleeping before trying again..."
+        sleep 10
+    done
 }
 
 bootstrap_remote_fedora()