build(checks): Disable go-opera until it supports Go 1.23

See:
* ethereum/go-ethereum#30100
* https://github.com/metacraft-labs/nix-blockchain-development/actions/runs/12000388841/job/33449458898?pr=264

Author: PetarKirov

packages/default.nix

@@ -48,6 +48,7 @@
     disabledPackages = [
       "circ"
       "leap"
+      "go-opera"
     ];
   in rec {
     packages = self'.legacyPackages.metacraft-labs;