Recent sphinx versions store the output directory as a PosixPath rath… #206

Job	Run time
convert_notebooks (none, ubuntu:rolling, export DEBIAN_FRONTEND="noninteractive" apt -y -qq updat...	1m 8s
convert_notebooks (none, ubuntu:rolling, export DEBIAN_FRONTEND="noninteractive" apt -y -qq updat...	2m 21s
convert_notebooks (dolfin, numericalpdes/base_images:fenics, export DEBIAN_FRONTEND="noninteracti...	3m 32s
convert_notebooks (dolfin, numericalpdes/base_images:fenics, export DEBIAN_FRONTEND="noninteracti...	3m 32s
convert_notebooks (dolfinx, dolfinx/dolfinx:nightly, export DEBIAN_FRONTEND="noninteractive" apt ...	1m 28s
convert_notebooks (dolfinx, dolfinx/dolfinx:nightly, export DEBIAN_FRONTEND="noninteractive" apt ...	2m 38s
convert_notebooks (firedrake, firedrakeproject/firedrake, export DEBIAN_FRONTEND="noninteractive"...	3m 1s
convert_notebooks (firedrake, firedrakeproject/firedrake, export DEBIAN_FRONTEND="noninteractive"...	5m 39s
warn	0s
warn	0s
website	0s
website	1m 16s
	24m 35s

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