fix: add encodings.idna to the denylist [backport 2.10] #54501

Job	Run time
build-and-publish-latest-snapshot-image	0s
test_unit (dd-lib-python-init-test-django)	3m 6s
test_unit_no_instrumentation (dd-lib-python-init-test-django-unsupported-python)	3m 14s
test_unit (dd-lib-python-init-test-django-gunicorn)	3m 3s
test_unit_no_instrumentation (dd-lib-python-init-test-django-unsupported-package)	3m 14s
test_unit (dd-lib-python-init-test-django-gunicorn-alpine)	2m 49s
test_unit (dd-lib-python-init-test-django-uvicorn)	3m 9s
test_unit (dd-lib-python-init-test-django-no-perms)	3m 20s
test_unit (dd-lib-python-init-test-django-pre-installed)	3m 14s
test_unit (dd-lib-python-init-test-django-unsupported-package-force)	3m 4s
build-and-publish-test-image / wait_for_package	6s
build-and-publish-test-image / build_push / build_push	12m 18s
test-runner-test (dd-lib-python-init-test-django)	4m 24s
test-runner-test (dd-lib-python-init-test-django-gunicorn)	4m 52s
test-runner-test (dd-lib-python-init-test-django-uvicorn)	4m 24s
	54m 17s

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