Bump microsoft-graph from 5.5.0 to 5.6.0 in /msal-obo-sample#51

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dependabot/maven/msal-obo-sample/com.microsoft.graph-microsoft-graph-5.6.0Azure-Samples/ms-identity-java-webapi:dependabot/maven/msal-obo-sample/com.microsoft.graph-microsoft-graph-5.6.0Copy head branch name to clipboard