Update the bundle for gobl 0.504.0 (FI + DK addons)

[rilla]

Context

gobl 0.504.0 approves two new external addons — fi-finvoice-v3 (Finland) and dk-oioubl-v2 (Denmark) — so the bundle needs both to satisfy TestApprovedAddonsAvailable. Neither can land alone: with gobl bumped, whichever is missing fails that test.

Changes

• Update to gobl 0.504.0 — the release also changes the signing claims, so internal/ops/sign.go passes bare GOBL Net addresses (SignOptions.Issuer/Audience become net.Address) rather than gobl: URIs. Nothing populates those fields yet, so there are no callers to update.
• fi-finvoice-v3 at gobl.fi.finvoice v0.0.2 — the version built against 0.504.0's cbc.Code credit-transfer fields.
• dk-oioubl-v2 at gobl.dk.oioubl v0.0.1.

All ten approved addons now register through the bundle, and the full suite passes.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.58%. Comparing base (44a7221) to head (eaaff0b).

Files with missing lines	Patch %	Lines
internal/ops/sign.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
+ Coverage   72.43%   72.58%   +0.15%     
==========================================
  Files          47       47              
  Lines        1988     1988              
==========================================
+ Hits         1440     1443       +3     
+ Misses        468      465       -3     
  Partials       80       80              

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