fix(anoncreds): Buffer not imported from core (openwallet-foundation#…

…1367)

Signed-off-by: Ariel Gentile <gentilester@gmail.com>

packages/anoncreds/src/utils/credential.ts

@@ -1,7 +1,7 @@
 import type { AnonCredsSchema, AnonCredsCredentialValues } from '../models'
 import type { CredentialPreviewAttributeOptions, LinkedAttachment } from '@aries-framework/core'
 
-import { AriesFrameworkError, Hasher, encodeAttachment } from '@aries-framework/core'
+import { AriesFrameworkError, Hasher, encodeAttachment, Buffer } from '@aries-framework/core'
 import BigNumber from 'bn.js'
 
 const isString = (value: unknown): value is string => typeof value === 'string'