How to convert srcset links from http to https?

[mariya]

After migrating http to https, still we are getting http links in wordpress.
How to convert srcset links from http to https?

[edited by: travelin_cat at 12:12 pm (utc) on Jun 3, 2020]
[edit reason] Per our TOC, we don't allow specifics such as email addresses and urls [/edit]

[not2easy]

Are these internal links?

[mariya]

HTML5 Shiv script and svg xmlns attribute value protocol