proposal: add date to release notes

[3052]

Proposal Details

this page has dates:
https://go.dev/doc/devel/release

but if you pick a release no date at all:
https://go.dev/doc/go1.23

to me the date is the single most important piece of information on the entire page, so the fact that its missing is concerning

[gabyhelp]

Related Issues and Documentation

• x/website: include release dates in release notes #54170
• x/website: show release dates on downloads page #37105 (closed)

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