fix: Use only 46 bits for priorities of generated Kong routes

[randmonkey]

What this PR does / why we need it:

Which issue this PR fixes:

fixes #5009

Special notes for your reviewer:

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR

[team-k8s-bot]

E2E (targeted) tests with KIND-based clusters were started at https://github.com/Kong/kubernetes-ingress-controller/actions/runs/6690809874

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (256ce95) 72.9% compared to head (2d53e9c) 73.0%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #5010   +/-   ##
=====================================
  Coverage   72.9%   73.0%           
=====================================
  Files        167     167           
  Lines      18719   18718    -1     
=====================================
+ Hits       13654   13666   +12     
+ Misses      4233    4223   -10     
+ Partials     832     829    -3     

Files	Coverage Δ
internal/dataplane/parser/translators/atc_utils.go	100.0% <ø> (ø)
...rnal/dataplane/parser/translators/grpcroute_atc.go	93.6% <94.1%> (-0.1%)	⬇️
...rnal/dataplane/parser/translators/httproute_atc.go	90.8% <95.4%> (ø)

... and 3 files with indirect coverage changes

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[pmalek]

Let's not bump this in a PR not related to Gateway API

[randmonkey]

I checked out to the branch from another branch to update the conformance tests. I will make another PR from main branch and close this.