Fix formatting of mac addresses from dhcp discovery mocking in vicare (#110613)

dhcp returns addresses in lowercase without :

tests/components/vicare/test_config_flow.py

@@ -30,7 +30,7 @@ VALID_CONFIG = {
 DHCP_INFO = dhcp.DhcpServiceInfo(
     ip="1.1.1.1",
     hostname="mock_hostname",
-    macaddress=MOCK_MAC,
+    macaddress=MOCK_MAC.lower().replace(":", ""),
 )