Fix nasa srtm tests

[goergen95]

• Skips tests for NASA SRTM if SSL certificate of CIGAR is expired
• removed NASA SRTM data from wide-output vignette and used traveltime instead

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: -0.52 :warning:

Comparison is base (1f4c7f7) 78.54% compared to head (2719bae) 78.03%.

:exclamation: Current head 2719bae differs from pull request most recent head f275a99. Consider uploading reports for the commit f275a99 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #173 +/- ## ========================================== - Coverage 78.54% 78.03% -0.52% ========================================== Files 40 40 Lines 1944 1944 ========================================== - Hits 1527 1517 -10 - Misses 417 427 +10 ``` [see 1 file with indirect coverage changes](https://app.codecov.io/gh/mapme-initiative/mapme.biodiversity/pull/173/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mapme-initiative)

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