Bump Microsoft.Azure.KeyVault from 3.0.3 to 3.0.4
Bump Microsoft.Azure.KeyVault from 3.0.3 to 3.0.4

Bumps [Microsoft.Azure.KeyVault](https://github.com/Azure/azure-sdk-for-net) from 3.0.3 to 3.0.4.
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](https://github.com/Azure/azure-sdk-for-net/commits/Microsoft.Azure.KeyVault_3.0.4)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
onovotny/SignService,onovotny/SignService,onovotny/SignService