chore: run tox w/o sdist

[jkowalleck]

our sdist config ships tests and docs.

when you have a lot of venvs laying around in the tests or docs flder, then poetry build -f sdist crashes ... a known bug of poetry ...

per default, tox installs in sdist mode ....
this causes issues locally, ... which is annoying.

here is a workaround: dont build sdist, build wheel only.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅ (target: 80.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (0feede2)	1071	1036	96.73%
Head commit (f164670)	1071 (+0)	1036 (+0)	96.73% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#819)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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