Update codeberg.org/forgejo/forgejo Docker tag to v15

[renovate]

This PR contains the following updates:

Package	Update	Change
codeberg.org/forgejo/forgejo (source)	major	14.0.5 → 15.0.3

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Release Notes

forgejo/forgejo (codeberg.org/forgejo/forgejo)

v15.0.3

Compare Source

See https://codeberg.org/forgejo/forgejo/src/branch/forgejo/release-notes-published/15.0.3.md

v15.0.2

Compare Source

See https://codeberg.org/forgejo/forgejo/src/branch/forgejo/release-notes-published/15.0.2.md

v15.0.1

Compare Source

See https://codeberg.org/forgejo/forgejo/src/branch/forgejo/release-notes-published/15.0.1.md

v15.0.0

Compare Source

See https://codeberg.org/forgejo/forgejo/src/branch/forgejo/release-notes-published/15.0.0.md

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