Fix cache's Last-Modified header by ensuring it is set to UTC
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What does this MR do?
Convert to UTC before formatting to http.TimeFormat
Why was this MR needed?
https://pkg.go.dev/net/http#TimeFormat
TimeFormat is the time format to use when generating times in HTTP headers.
It is like time.RFC1123 but hard-codes GMT as the time zone.
The time being formatted must be in UTC for Format to generate the correct format.
What's the best way to test this MR?
What are the relevant issue numbers?
Closes #38403
Maybe also #29394
Edited by Arran Walker