Fix Bcrypt test: accept \$2a\$ prefix from bcryptjs v2.4.3

bcryptjs 2.4.3 generates \$2a\$10\$ hashes; the test regex required \$2b\$10\$.
Both prefixes are functionally equivalent; accept either with [ab].

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/node/tests/operations.mjs

@@ -136,7 +136,7 @@ Tiger-128`;
     it("Bcrypt", async () => {
         const result = await chef.bcrypt("Put a Sock In It");
         const strResult = result.toString();
-        assert.match(strResult, /^\$2b\$10\$[./A-Za-z0-9]{53}$/);
+        assert.match(strResult, /^\$2[ab]\$10\$[./A-Za-z0-9]{53}$/);
         assert.equal(strResult.split("$").length, 4);
     }),