Bump keycloak-connect from 15.0.2 to 21.1.0

[dependabot[bot]]

Bumps keycloak-connect from 15.0.2 to 21.1.0.

Commits

• 72d0170 Set version to 21.1.0
• cee3608 Use a valid SemVer format for the SNAPSHOT version (#475)
• 190a947 Prevent open redirect when checking SSO
• e4bd6b7 Add a deprecation message to the README (#449)
• a56a309 Bump @​octokit/rest from 19.0.4 to 19.0.5 (#440)
• f8e397c Bump body-parser from 1.20.0 to 1.20.1 (#436)
• 9061a73 Bump express from 4.18.1 to 4.18.2 (#437)
• c34daa0 Remove status badges that are no longer updated (#432)
• e5921ff Bump node-fetch from 3.2.9 to 3.2.10 (#409)
• 3587ea4 Bump @​octokit/rest from 19.0.3 to 19.0.4 (#415)
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #256.