Using http protocol is insecure. Use https instead [#3375004]

In l10n_update/l10n_update.api.php line 53 there are a http url instead of https, and sonarqube alerts me in the recurity review:
"Using http protocol is insecure. Use https instead"

Issue fork l10n_update-3375004

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3375004-using-http-protocol changes, plain diff MR !2
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