sphinx/view_in_gitlab: Mark extension safe for parallel reading

It should fix doc CI builds as parallel build was recently enabled in jobs.

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Jenkins job DDOC/builds #496 failed .
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Arf, the carousel extension we are using is not declared safe for parallel reading so the build still fails.

WARNING: the sphinx_carousel.carousel extension does not declare if it is safe for parallel reading, assuming it isn't - please ask the extension author to check and make it explicit

I added a hack to filter out this type of warnings in a new commit.

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• cee9a5d3 - sphinx/conf.py: Filter out warnings related to extension paralell read

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Jenkins job DDOC/builds #497 failed .
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added 1 commit

• df4e79b1 - sphinx/conf.py: Filter out warnings related to extension paralell read

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Jenkins job DDOC/builds #498 failed .
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• 38ce3f95 - sphinx/conf.py: Filter out warnings related to extension paralell read

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Jenkins job DDOC/builds #499 succeeded .
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merged