Bump actions/add-to-project from 0.6.0 to 0.6.1 (#1682) #6098

Job	Run time
Black (Python3.9)	1m 3s
py39-prefetch-coverage (Python3.9, windows-latest)	6m 31s
py310-coverage (Python3.10, macos-latest)	6m 6s
test-conda-Python3.9	6m 23s
test-${{ matrix.tox-env }} (Python${{ matrix.python-version }})	0s
py39-coverage-sbck (Python3.9, ubuntu-latest)	5m 21s
test-conda-Python3.12	7m 5s
py310-coverage-lmoments (Python3.10, ubuntu-latest)	8m 53s
py311-coverage-sbck (Python3.11, ubuntu-latest)	5m 26s
py312-coverage-numba (Python3.12, ubuntu-latest)	6m 38s
notebooks_doctests (Python3.10, ubuntu-latest)	7m 2s
offline-prefetch (Python3.11, ubuntu-latest)	4m 47s
finish	16s
	1h 5m 31s

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