fix: update Route's priority type to uint64

[pmalek]

Route's priority in expression routes should be of type uint64 instead of int.

---

There's a related (linked in the comment) issue for Gateway which returns integers in scientific notation: https://konghq.atlassian.net/browse/FTI-5515. When that's solved the commented test case should be uncommented.

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Also update the changelog to release 0.48.0.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (847d46d) 53.05% compared to head (4e723d2) 53.16%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #378      +/-   ##
==========================================
+ Coverage   53.05%   53.16%   +0.10%     
==========================================
  Files          69       69              
  Lines        5200     5212      +12     
==========================================
+ Hits         2759     2771      +12     
  Misses       1857     1857              
  Partials      584      584              

Flag	Coverage Δ
2.1	33.15% <58.33%> (+0.05%)	⬆️
2.2	33.15% <58.33%> (-11.43%)	⬇️
2.3	45.31% <58.33%> (+0.03%)	⬆️
2.4	33.28% <58.33%> (-12.08%)	⬇️
2.5	45.39% <58.33%> (+0.02%)	⬆️
2.6	45.39% <58.33%> (+0.02%)	⬆️
2.7	33.28% <58.33%> (-13.58%)	⬇️
2.8	33.28% <58.33%> (-13.58%)	⬇️
3.0	50.61% <75.00%> (+0.05%)	⬆️
3.1	52.07% <75.00%> (+0.05%)	⬆️
3.2	52.12% <75.00%> (+0.05%)	⬆️
3.3	52.12% <75.00%> (+0.05%)	⬆️
3.4	52.45% <75.00%> (+0.05%)	⬆️
community	38.37% <100.00%> (+0.14%)	⬆️
enterprise	51.84% <100.00%> (+0.11%)	⬆️
enterprise-nightly	50.80% <75.00%> (?)
integration	53.16% <100.00%> (+0.10%)	⬆️
nightly	37.66% <75.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
kong/route.go	0.00% <ø> (ø)
kong/test_utils.go	62.50% <100.00%> (+2.79%)	⬆️
kong/utils.go	88.37% <100.00%> (+0.06%)	⬆️

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