[release-4.12] NO-JIRA: extensions/Dockerfile: bump builder to f40

[sdodson]

Backports #1585

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[aaradhak]

/lgtm

[marmijo]

Not against this, but #1583 will be backported this far back and it will set the builder as fedora:latest

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This pull-request has been approved by: aaradhak, marmijo, sdodson

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[marmijo]

/retitle [release-4.12] NO-JIRA: extensions/Dockerfile: bump builder to f40

[sdodson]

Yeah I just saw that but then figured this brings these branches inline with others and I think that'll at least make the eventual cherry-picks clean.

[marmijo]

Works for me! I don't remember what the original reasoning was behind not backporting it this far sooner. I know we experienced an issue with fedora:38 content and this branch was working fine.

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