build(deps): bump @digitalcredentials/vc from 1.1.2 to 6.0.0

Bumps [@digitalcredentials/vc](https://github.com/digitalcredentials/vc-js) from 1.1.2 to 6.0.0.
- [Changelog](https://github.com/digitalcredentials/vc/blob/main/CHANGELOG.md)
- [Commits](digitalcredentials/vc@v1.1.2...v6.0.0)

---
updated-dependencies:
- dependency-name: "@digitalcredentials/vc"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

packages/core/package.json

@@ -25,7 +25,7 @@
   "dependencies": {
     "@digitalcredentials/jsonld": "^5.2.1",
     "@digitalcredentials/jsonld-signatures": "^9.3.1",
-    "@digitalcredentials/vc": "^1.1.2",
+    "@digitalcredentials/vc": "^6.0.0",
     "@multiformats/base-x": "^4.0.1",
     "@stablelib/ed25519": "^1.0.2",
     "@stablelib/random": "^1.0.1",