Bump org.wiremock:wiremock-standalone from 4.0.0-beta.20 to 4.0.0-beta.21 in /server#387

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dependabot/maven/server/org.wiremock-wiremock-standalone-4.0.0-beta.21OpenConext/OpenConext-access:dependabot/maven/server/org.wiremock-wiremock-standalone-4.0.0-beta.21Copy head branch name to clipboard