Bump dependencies to fix vulnerabilities in tests

[frederikprijck]

Changes

Adds explicit depenencies for known vulnerable dependencies to ensure we use versions that are fixed.

References

✗ Denial of Service (DoS) [High Severity][https://security.snyk.io/vuln/SNYK-DOTNET-SYSTEMNETHTTP-60045] in System.Net.Http@4.3.0
    introduced by Moq@4.14.7 > Castle.Core@4.4.0 > NETStandard.Library@1.6.1 > System.Net.Http@4.3.0 and 4 other path(s)
  This issue was fixed in versions: 4.1.2, 4.3.2
  ✗ Improper Certificate Validation [High Severity][https://security.snyk.io/vuln/SNYK-DOTNET-SYSTEMNETHTTP-60046] in System.Net.Http@4.3.0
    introduced by Moq@4.14.7 > Castle.Core@4.4.0 > NETStandard.Library@1.6.1 > System.Net.Http@4.3.0 and 4 other path(s)
  This issue was fixed in versions: 4.1.2, 4.3.2
  ✗ Privilege Escalation [High Severity][https://security.snyk.io/vuln/SNYK-DOTNET-SYSTEMNETHTTP-60047] in System.Net.Http@4.3.0
    introduced by Moq@4.14.7 > Castle.Core@4.4.0 > NETStandard.Library@1.6.1 > System.Net.Http@4.3.0 and 4 other path(s)
  This issue was fixed in versions: 4.1.2, 4.3.2
  ✗ Authentication Bypass [Medium Severity][https://security.snyk.io/vuln/SNYK-DOTNET-SYSTEMNETHTTP-60048] in System.Net.Http@4.3.0
    introduced by Moq@4.14.7 > Castle.Core@4.4.0 > NETStandard.Library@1.6.1 > System.Net.Http@4.3.0 and 4 other path(s)
  This issue was fixed in versions: 4.1.2, 4.3.2
  ✗ Information Exposure [High Severity][https://security.snyk.io/vuln/SNYK-DOTNET-SYSTEMNETHTTP-72439] in System.Net.Http@4.3.0
    introduced by Moq@4.14.7 > Castle.Core@4.4.0 > NETStandard.Library@1.6.1 > System.Net.Http@4.3.0 and 4 other path(s)
  This issue was fixed in versions: 2.0.20710, 4.0.1-beta-23225, 4.1.4, 4.3.4
  ✗ Regular Expression Denial of Service (ReDoS) [High Severity][https://security.snyk.io/vuln/SNYK-DOTNET-SYSTEMTEXTREGULAREXPRESSIONS-174708] in System.Text.RegularExpressions@4.3.0
    introduced by Moq@4.14.7 > Castle.Core@4.4.0 > NETStandard.Library@1.6.1 > System.Text.RegularExpressions@4.3.0 and 15 other path(s)
  This issue was fixed in versions: 4.3.1

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors