feat(rhdh): upgrade default PostgreSQL to 18 - #546

No file matched to [/home/runner/work/rhdh-chart/rhdh-chart/**/*requirements*.txt,/home/runner/work/rhdh-chart/rhdh-chart/**/*requirements*.in,/home/runner/work/rhdh-chart/rhdh-chart/**/*constraints*.txt,/home/runner/work/rhdh-chart/rhdh-chart/**/*constraints*.in,/home/runner/work/rhdh-chart/rhdh-chart/**/pyproject.toml,/home/runner/work/rhdh-chart/rhdh-chart/**/uv.lock,/home/runner/work/rhdh-chart/rhdh-chart/**/*.py.lock]. The cache will never get invalidated. Make sure you have checked out the target repository and configured the cache-dependency-glob input correctly.