Upgrade golang and libs

[BojanZelic]

• Upgrade golang from 1.19 -> 1.21
• Upgrade client-go, controller-runtime, api-machinery, ect..

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7ba60cf) 64.05% compared to head (782894d) 68.58%.

❗ Current head 782894d differs from pull request most recent head 036245f. Consider uploading reports for the commit 036245f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
+ Coverage   64.05%   68.58%   +4.53%     
==========================================
  Files          17       16       -1     
  Lines        1249     1162      -87     
==========================================
- Hits          800      797       -3     
+ Misses        369      287      -82     
+ Partials       80       78       -2     

Files	Coverage Δ
api/v1alpha1/cloudflareaccessapplication_types.go	94.64% <ø> (ø)
api/v1alpha1/cloudflareaccessgroup_types.go	97.36% <ø> (ø)
api/v1alpha1/cloudflareservicetoken_types.go	100.00% <ø> (ø)
internal/cfapi/access_group_types.go	100.00% <100.00%> (ø)
internal/services/accesspolicies.go	88.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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