Bump golang from 1.22 to 1.23 in /tests/conformance #7374

Job	Run time
Checks and variables	2m 25s
NJS Unit Tests	12s
Unit Tests	1m 29s
Build Binary	33s
Build Plus images / build	51s
Build OSS images (nginx, linux/arm64, linux/amd64) / build	1m 15s
Build OSS images (ngf, linux/arm64, linux/amd64) / build	1m 3s
Helm Tests	0s
Conformance tests (nginx, v1.25.16, false) / Run Tests	12m 36s
Conformance tests (nginx, v1.25.16, true) / Run Tests	11m 59s
Conformance tests (nginx, v1.30.2, true) / Run Tests	12m 19s
Conformance tests (nginx, v1.30.2, false) / Run Tests	11m 17s
Conformance tests (plus, v1.25.16, false) / Run Tests	12m 38s
Conformance tests (plus, v1.25.16, true) / Run Tests	17m 18s
Conformance tests (plus, v1.30.2, false) / Run Tests	11m 43s
Conformance tests (plus, v1.30.2, true) / Run Tests	16m 41s
Functional tests (nginx, v1.25.16) / Run Tests	16m 2s
Functional tests (nginx, v1.30.2) / Run Tests	14m 57s
Functional tests (plus, v1.25.16) / Run Tests	13m 8s
Functional tests (plus, v1.30.2) / Run Tests	14m 14s
Package and Publish Helm Chart	0s
	2h 52m 40s

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