remove bleeding edge libpysal install from `testing.yml`

[jGaboardi]

This block can be removed since libpysal is being installed from GitHub within the CI environments marked dev.

esda/.github/workflows/testing.yml

Lines 70 to 73 in a9a4d4f

	- name: install bleeding edge libpysal (Ubuntu / Python 3.10)
	run: |
	pip install git+https://github.com/pysal/libpysal.git@main
	if: matrix.os == 'ubuntu-latest' && contains(matrix.environment-file, 'DEV')