Ignore security issue with mkdocs-material

This requires handling upstream (see linked issue), trying to bump this
dependency errored with:

    Because mkdocs-material (9.5.32) depends on mkdocs (>=1.6,<2.0)
     and portray (1.8.0) depends on mkdocs (>=1.3.0,<1.4.0), mkdocs-material (9.5.32) is incompatible with portray (1.8.0).
    And because no versions of portray match >1.8.0, mkdocs-material (9.5.32) is incompatible with portray (>=1.8.0).
    So, because isort depends on both portray (>=1.8.0) and mkdocs-material (9.5.32), version solving failed.

scripts/lint.sh

@@ -7,5 +7,7 @@ poetry run black --target-version py38 .
 poetry run isort --profile hug --check --diff isort/ tests/
 poetry run isort --profile hug --check --diff example_*/
 poetry run flake8 isort/ tests/
-poetry run safety check -i 51457 -i 59587 # https://github.com/tiangolo/typer/discussions/674
+ # 51457: https://github.com/tiangolo/typer/discussions/674
+ # 72715: https://github.com/timothycrosley/portray/issues/95
+poetry run safety check -i 72715 -i 51457 -i 59587
 poetry run bandit -r isort/ -x isort/_vendored