fix: fix AbstractServiceDiscovery.update when doRegister first failed

[conghuhu]

What is the purpose of the change

close #14126

Brief changelog

Verifying this change

see dubbo-registry/dubbo-registry-api/src/test/java/org/apache/dubbo/registry/client/ServiceDiscoveryCacheTest.java

Checklist

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[sonarcloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[songxiaosheng]

LGTM