Keep it consistent with simple quotes

[jacquesbh]

Q	A
Branch?	master
Bug fix?	no
New feature?	no
BC breaks?	no
Deprecations?	no
Related tickets
License	MIT

Nothing big… The whole file is using simple quotes, so I changed these 4 double quotes.

Code quality comes from small changes.

[jacquesbh]

Actually I didn't think of hacktoberfest. This PR can be marked as spam and merged anyway, I don't care :-).

[Zales0123]

Targeting consistency is never a spam @jacquesbh 😄 🖖

[Zales0123]

Thanks, Jacques! 🥇

[vvasiloi]

@Zales0123 what do you think about having a linter for it?
Symfony's lint:yaml command only checks if the syntax is valid.
Found these on the internet: https://github.com/adrienverge/yamllint and https://github.com/stoplightio/spectral
Also remembered https://github.com/sspooky13/yaml-standards from #10943.

[Zales0123]

@vvasiloi automatization is the thing I admire the most 🖖 I would totally consider it 🚀