fix: support issuer with and without trailing slash

[aeneasr]

BREAKING CHANGE: The iss (issuer) value no longer appends a trailing slash but instead uses the raw value set in the config.

Setting

urls:
  self:
    issuer: https://auth.example.com

has changed

-  "iss": "https://auth.example.com/"
+  "iss": "https://auth.example.com"

To set a trailing slash make sure to set it in the config value:

urls:
  self:
    issuer: https://auth.example.com/

Closes #1482

Related issue(s)

Checklist

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• I have referenced an issue containing the design document if my change introduces a new feature.
• I am following the contributing code guidelines.
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• I have added tests that prove my fix is effective or that my feature works.
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Further Comments

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@@           Coverage Diff           @@
##             v2.x    #3151   +/-   ##
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  Files           ?      114           
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