Allow TetGen v1 and v2. #389

Job	Run time
Documentation	14m 14s
Julia lts - ubuntu-latest - x64 - pull_request	6m 15s
Julia lts - windows-latest - x64 - pull_request	9m 43s
Julia lts - macOS-13 - x64 - pull_request	9m 30s
Julia lts - macOS-latest - aarch64 - pull_request	4m 41s
Julia 1 - ubuntu-latest - x64 - pull_request	11m 9s
Julia 1 - windows-latest - x64 - pull_request	14m 56s
Julia 1 - macOS-13 - x64 - pull_request	14m 22s
Julia 1 - macOS-latest - aarch64 - pull_request	9m 5s
Julia nightly - ubuntu-latest - x64 - pull_request	10m 31s
Julia nightly - windows-latest - x64 - pull_request	13m 41s
Julia nightly - macOS-13 - x64 - pull_request	19m 17s
Julia nightly - macOS-latest - aarch64 - pull_request	8m 3s
	2h 25m 27s

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