Pick up e-invoicing shared-package fixes (EN16931 conformance bugs)

Phase 4's Mustang CI check found and fixed several real EN16931/PDF-A-3 compliance bugs in the shared package after Phase 3 had already shipped: a missing CII Delivery element, line amounts reported gross instead of net, missing AllowanceCharge entries for shipping/discount, and a BR-CO-16 rounding mismatch. Bumps the git-dependency lockfile to git.mk360.de/Marco/einfach-produktiv-invoicing@fd5d8e6 to get the fix into production-generated invoices.

package-lock.json

@@ -359,7 +359,7 @@
     },
     "node_modules/@einfach-produktiv/invoicing": {
       "version": "0.1.0",
-      "resolved": "git+https://git.mk360.de/Marco/einfach-produktiv-invoicing.git#68d705455726eaa24f1b4b3183b99af3061e1ea8",
+      "resolved": "git+https://git.mk360.de/Marco/einfach-produktiv-invoicing.git#fd5d8e688b1ab6b13dfd734e194a780b8a2b12d2",
       "dependencies": {
         "@e-invoice-eu/core": "^3.1.1"
       },