[stable-2.13] Fix ansible-test-git test for newer git versions.

The latest versions of `git` include a fix for CVE-2022-39253. The fix blocks the file protocol by default.

See: 45c9f05c44/Documentation/RelNotes/2.30.6.txt
(cherry picked from commit 4202acb41b)

Co-authored-by: Matt Clay <matt@mystile.com>

test/integration/targets/ansible-test/collection-tests/git-common.bash

@@ -45,7 +45,7 @@ cd "${GIT_TOP_LEVEL}"
 git init
 
 # add submodule
-git submodule add "${WORK_DIR}/sub" "${SUBMODULE_DST}"
+git -c protocol.file.allow=always submodule add "${WORK_DIR}/sub" "${SUBMODULE_DST}"
 
 # prepare for tests
 expected="${WORK_DIR}/expected.txt"