multiple mutable rev warnings issued on autoupdate #2010

~/projects/pytest-cov   pre-commit-autoupdate  pipx run pre-commit autoupdate    
[WARNING] The 'rev' field of repo 'https://github.com/pre-commit/pre-commit-hooks' appears to be a mutable reference (moving tag / branch).  Mutable references are never updated after first install and are not supported.  See https://pre-commit.com/#using-the-latest-version-for-a-repository for more details.  Hint: `pre-commit autoupdate` often fixes this.
[WARNING] The 'rev' field of repo 'https://github.com/timothycrosley/isort' appears to be a mutable reference (moving tag / branch).  Mutable references are never updated after first install and are not supported.  See https://pre-commit.com/#using-the-latest-version-for-a-repository for more details.  Hint: `pre-commit autoupdate` often fixes this.
[WARNING] The 'rev' field of repo 'https://gitlab.com/pycqa/flake8' appears to be a mutable reference (moving tag / branch).  Mutable references are never updated after first install and are not supported.  See https://pre-commit.com/#using-the-latest-version-for-a-repository for more details.  Hint: `pre-commit autoupdate` often fixes this.
[WARNING] The 'rev' field of repo 'https://github.com/pre-commit/pre-commit-hooks' appears to be a mutable reference (moving tag / branch).  Mutable references are never updated after first install and are not supported.  See https://pre-commit.com/#using-the-latest-version-for-a-repository for more details.  Hint: `pre-commit autoupdate` often fixes this.
[WARNING] The 'rev' field of repo 'https://github.com/timothycrosley/isort' appears to be a mutable reference (moving tag / branch).  Mutable references are never updated after first install and are not supported.  See https://pre-commit.com/#using-the-latest-version-for-a-repository for more details.  Hint: `pre-commit autoupdate` often fixes this.
[WARNING] The 'rev' field of repo 'https://gitlab.com/pycqa/flake8' appears to be a mutable reference (moving tag / branch).  Mutable references are never updated after first install and are not supported.  See https://pre-commit.com/#using-the-latest-version-for-a-repository for more details.  Hint: `pre-commit autoupdate` often fixes this.
Updating https://github.com/pre-commit/pre-commit-hooks ... updating master -> v4.0.1.
Updating https://github.com/timothycrosley/isort ... updating master -> 5.9.3.
Updating https://gitlab.com/pycqa/flake8 ... updating master -> 3.9.2.