Fixes appstream test errors

[gdavison]

Description

Fixes TestAccAppStreamStack_withTags

Fixes TestAccAppStreamFleet_multiSession

Output from Acceptance Testing

% make testacc PKG=appstream TESTS='TestAccAppStreamStack_withTags|TestAccAppStreamFleet_multiSession'

--- PASS: TestAccAppStreamStack_withTags (38.95s)
--- PASS: TestAccAppStreamFleet_multiSession (779.75s)

[github-actions]

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[jar-b]

LGTM 🚀