chore: update K8s deps and fix api changes

[Kavindu-Dodan]

This PR

Update K8s dependencies & attempt to fix #515

Note

Unfortunately updating deps to v0.27.x variant failed as I encountered errors bumping controller-runtime to v0.15.x

See log below from the attempt

2023/08/07 18:54:08 http: panic serving 172.23.0.5:41558: runtime error: invalid memory address or nil pointer dereference
goroutine 182 [running]:
net/http.(*conn).serve.func1()
    /usr/local/go/src/net/http/server.go:1854 +0xb0
panic({0x1186200, 0x21924b0})
    /usr/local/go/src/runtime/panic.go:890 +0x248
sigs.k8s.io/controller-runtime/pkg/webhook/admission.(*Decoder).DecodeRaw(0x0, {{0x4000492300, 0x2c9, 0x300}, {0x0, 0x0}}, {0x15d50f0, 0x4000485b80})
    /go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.1/pkg/webhook/admission/decode.go:76 +0xec
sigs.k8s.io/controller-runtime/pkg/webhook/admission.(*Decoder).Decode(_, {{{0x40005d55c0, 0x24}, {{0x40005fb710, 0x14}, {0x400012c4d0, 0x8}, {0x40005fb728, 0x18}}, {{0x40005fb740, ...}, ...}, ...}}, ...)
    /go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.1/pkg/webhook/admission/decode.go:49 +0x74
github.com/open-feature/open-feature-operator/webhooks.(*FeatureFlagConfigurationValidator).Handle(_, {_, _}, {{{0x40005d55c0, 0x24}, {{0x40005fb710, 0x14}, {0x400012c4d0, 0x8}, {0x40005fb728, ...}}, ...}})
    /workspace/webhooks/featureflagconfiguration_webhook.go:36 +0x94
sigs.k8s.io/controller-runtime/pkg/webhook/admission.(*Webhook).Handle(_, {_, _}, {{{0x40005d55c0, 0x24}, {{0x40005fb710, 0x14}, {0x400012c4d0, 0x8}, {0x40005fb728, ...}}, ...}})
    /go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.1/pkg/webhook/admission/webhook.go:169 +0x180
sigs.k8s.io/controller-runtime/pkg/webhook/admission.(*Webhook).ServeHTTP(0x400052c8c0, {0xffff9055f038?, 0x400052df90}, 0x400039c900)
    /go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.1/pkg/webhook/admission/http.go:98 +0x994
github.com/prometheus/client_golang/prometheus/promhttp.InstrumentHandlerInFlight.func1({0xffff9055f038, 0x400052df90}, 0x4000507e00?)
    /go/pkg/mod/github.com/prometheus/client_golang@v1.15.1/prometheus/promhttp/instrument_server.go:60 +0xb0
net/http.HandlerFunc.ServeHTTP(0x15e6530?, {0xffff9055f038?, 0x400052df90?}, 0x400055f818?)
    /usr/local/go/src/net/http/server.go:2122 +0x38
github.com/prometheus/client_golang/prometheus/promhttp.InstrumentHandlerCounter.func1({0x15e6530?, 0x40004367e0?}, 0x400039c900)
    /go/pkg/mod/github.com/prometheus/client_golang@v1.15.1/prometheus/promhttp/instrument_server.go:147 +0xa0
net/http.HandlerFunc.ServeHTTP(0x400055fa58?, {0x15e6530?, 0x40004367e0?}, 0x40000f3db0?)
    /usr/local/go/src/net/http/server.go:2122 +0x38
github.com/prometheus/client_golang/prometheus/promhttp.InstrumentHandlerDuration.func2({0x15e6530, 0x40004367e0}, 0x400039c900)
    /go/pkg/mod/github.com/prometheus/client_golang@v1.15.1/prometheus/promhttp/instrument_server.go:109 +0x94
net/http.HandlerFunc.ServeHTTP(0x40004367e0?, {0x15e6530?, 0x40004367e0?}, 0x373e28?)
    /usr/local/go/src/net/http/server.go:2122 +0x38
net/http.(*ServeMux).ServeHTTP(0x40000f3d91?, {0x15e6530, 0x40004367e0}, 0x400039c900)
    /usr/local/go/src/net/http/server.go:2500 +0x13c
net/http.serverHandler.ServeHTTP({0x15d8e80?}, {0x15e6530, 0x40004367e0}, 0x400039c900)
    /usr/local/go/src/net/http/server.go:2936 +0x2c0
net/http.(*conn).serve(0x4000581680, {0x15e7180, 0x40005982d0})
    /usr/local/go/src/net/http/server.go:1995 +0x518
created by net/http.(*Server).Serve
    /usr/local/go/src/net/http/server.go:3089 +0x4e8

[codecov]

Codecov Report

Merging #518 (1662c80) into main (22a1e55) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #518   +/-   ##
=======================================
  Coverage   82.78%   82.78%           
=======================================
  Files          22       22           
  Lines        1423     1423           
=======================================
  Hits         1178     1178           
  Misses        207      207           
  Partials       38       38           

Flag	Coverage Δ
unit-tests	82.78% <ø> (ø)

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