chore: bump dependencies

[hperl]

This PR swaps the configuration library from viperx for koanf and updates the dependencies, most importantly to ory/x.

This work relates to the effort to use Oathkeeper as a gRPC/HTTP middleware in other projects.

Fixes #757

Breaking changes

• The health APIs now return a structured error if the service is not available as a JSON with the fields status, code , and message
• The environment variable JAEGER_PROPAGATION was removed. Use TRACING_PROVIDER_JAEGER_PROPAGATION

[codecov]

Codecov Report

Merging #999 (121e3c5) into master (972f37f) will increase coverage by 11.30%.
The diff coverage is 83.91%.

❗ Current head 121e3c5 differs from pull request most recent head 78c0acb. Consider uploading reports for the commit 78c0acb to get more accurate results

@@             Coverage Diff             @@
##           master     #999       +/-   ##
===========================================
+ Coverage   66.49%   77.79%   +11.30%     
===========================================
  Files         107       81       -26     
  Lines        4796     3873      -923     
===========================================
- Hits         3189     3013      -176     
+ Misses       1325      587      -738     
+ Partials      282      273        -9     

Impacted Files	Coverage Δ
api/credential.go	75.60% <ø> (ø)
api/decision.go	95.55% <ø> (ø)
api/health.go	0.00% <ø> (ø)
api/rule.go	52.17% <ø> (ø)
cmd/health.go	50.00% <0.00%> (ø)
cmd/root.go	15.38% <22.22%> (-30.07%)	⬇️
driver/driver_default.go	81.81% <60.00%> (-18.19%)	⬇️
x/testhelper.go	62.50% <62.50%> (ø)
internal/driver.go	77.77% <75.00%> (-22.23%)	⬇️
rule/fetcher_default.go	78.57% <78.78%> (+1.91%)	⬆️
... and 50 more

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[zepatrik]

This looks very good, just found some minor things 🎉

[aeneasr]

First-pass review :)

[aeneasr]

Great! This is basically in a mergable state with a few questions and requirements:

• in health_test.go it looks as if the health payloads have changed. If so, we should add this as a breaking change. Can you please update the PR description to match the changes made?
• some configuration environment variables have been deprecated, please add those to the breaking changes list above.
• check that the removed env vars are not used in helm charts and in ory cloud
• Search the documentation for removed config keys and remove them

[hperl]

Great! This is basically in a mergable state with a few questions and requirements:

• in health_test.go it looks as if the health payloads have changed. If so, we should add this as a breaking change. Can you please update the PR description to match the changes made?
• some configuration environment variables have been deprecated, please add those to the breaking changes list above.
• check that the removed env vars are not used in helm charts and in ory cloud
• Search the documentation for removed config keys and remove them

Done, no references to JAEGER_PROPAGATION were found in docs, cloud, k8s.