Appveyor: use newer conda packages and only run all tests on one platform #6774
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Since setting the miktex version as a workaround for the miktex related build failures, the miktex package was updated and an inkscape package was added in conda-forge.
Also install these packages only on one build so that the rest of the builds are shorter...
Also includes the enablement of the conda packages again.
Closes: #6682