Update versions for Key Vault servicing release

[heaths]

Only Certificates and Keys are being updated. To show these are all that changed:

$ git diff-tree -r --name-only Azure.Security.KeyVault.Keys_4.0.3..HEAD
sdk/keyvault/Azure.Security.KeyVault.Certificates/CHANGELOG.md
sdk/keyvault/Azure.Security.KeyVault.Certificates/src/Azure.Security.KeyVault.Certificates.csproj
sdk/keyvault/Azure.Security.KeyVault.Certificates/src/CertificateIssuer.cs
sdk/keyvault/Azure.Security.KeyVault.Certificates/src/CertificatePolicy.cs
sdk/keyvault/Azure.Security.KeyVault.Certificates/src/ImportCertificateOptions.cs
sdk/keyvault/Azure.Security.KeyVault.Certificates/src/IssuerProperties.cs
sdk/keyvault/Azure.Security.KeyVault.Certificates/src/MergeCertificateOptions.cs
sdk/keyvault/Azure.Security.KeyVault.Certificates/tests/CertificateClientLiveTests.cs
sdk/keyvault/Azure.Security.KeyVault.Certificates/tests/CertificateIssuerTests.cs
sdk/keyvault/Azure.Security.KeyVault.Certificates/tests/CertificatePolicyTests.cs
sdk/keyvault/Azure.Security.KeyVault.Certificates/tests/CertificatesTestBase.cs
sdk/keyvault/Azure.Security.KeyVault.Certificates/tests/SessionRecords/CertificateClientLiveTests/VerifyGetIssuer.json
sdk/keyvault/Azure.Security.KeyVault.Certificates/tests/SessionRecords/CertificateClientLiveTests/VerifyGetIssuerAsync.json
sdk/keyvault/Azure.Security.KeyVault.Keys/CHANGELOG.md
sdk/keyvault/Azure.Security.KeyVault.Keys/api/Azure.Security.KeyVault.Keys.netstandard2.0.cs
sdk/keyvault/Azure.Security.KeyVault.Keys/src/Azure.Security.KeyVault.Keys.csproj
sdk/keyvault/Azure.Security.KeyVault.Keys/src/CreateKeyOptions.cs
sdk/keyvault/Azure.Security.KeyVault.Keys/src/Cryptography/KeyResolver.cs
sdk/keyvault/Azure.Security.KeyVault.Keys/src/JsonWebKey.cs
sdk/keyvault/Azure.Security.KeyVault.Keys/tests/KeyResolverMockTests.cs