Don't expose Cults3D auth credentials in error messages

[Floppy]

Fixes https://github.com/manyfold3d/manyfold/security/advisories/GHSA-g66v-62f6-3h68#advisory-comment-138475

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

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

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (02ba320)	5259	4424	84.12%
Head commit (a146507)	5259 (+0)	4424 (+0)	84.12% (+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 (#4733)	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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