chore: fix INSTALL_LIBRARY_FROM_SOURCE in noxfile.py (#181)
chore: fix INSTALL_LIBRARY_FROM_SOURCE in noxfile.py (#181)

Source-Link: https://github.com/googleapis/synthtool/commit/6252f2cd074c38f37b44abe5e96d128733eb1b61
Post-Processor: 756ef36c55daf330711274796a009b4e78873d6d@sha256:50e35228649c47b6ca82aa0be3ff9eb2afce51c82b66c4a03fe4afeb5ff6c0fc
GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples