makefile: Pin black version

[jerry-skydio]

Black keeps updating in the background and breaking our
CI due to slightly different formatting between versions.
Fix this by pinning the version.

[jerry-skydio]

Reviews in this chain:
└#144 makefile: Pin black version

[jerry-skydio]

#	head	base	diff	date	summary
0	87d4e617	8009c60c	diff	Jan 29 10:32 AM	1 file changed, 1 insertion(+), 1 deletion(-)
1	f827cf87	7df39f05	rebase	Jan 29 10:37 AM	0 files changed
2	676c0885	7df39f05	diff	Feb 2 11:17 AM	2 files changed, 2 insertions(+), 2 deletions(-)
3	aa826f6b	7df39f05	diff	Feb 2 11:28 AM	1 file changed, 1 deletion(-)

[aaron-skydio]

Oh sorry .[dev] includes installing ., you shouldn't need both

[aaron-skydio]

Pip has no way afaik to just install dependencies of a package, which is incredibly silly