Migrate MockMvc Hamcrest assertions to AssertJ - #1120

No file matched to [/home/runner/work/rewrite-spring/rewrite-spring/**/*requirements*.txt,/home/runner/work/rewrite-spring/rewrite-spring/**/*requirements*.in,/home/runner/work/rewrite-spring/rewrite-spring/**/*constraints*.txt,/home/runner/work/rewrite-spring/rewrite-spring/**/*constraints*.in,/home/runner/work/rewrite-spring/rewrite-spring/**/pyproject.toml,/home/runner/work/rewrite-spring/rewrite-spring/**/uv.lock,/home/runner/work/rewrite-spring/rewrite-spring/**/*.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.