Update nginx Docker tag to v1.27.5 #12362

Job	Run time
Checks and variables	2m 22s
Unit Tests	2m 21s
NJS Unit Tests	10s
Build Binary	2m 33s
Build Plus images / build	1m 7s
Build OSS images (nginx, linux/arm64, linux/amd64) / build	1m 17s
Build OSS images (ngf, linux/arm64, linux/amd64) / build	1m 9s
Helm Tests	0s
Functional tests (nginx, v1.25.16) / Run Tests	15m 18s
Functional tests (nginx, v1.32.3) / Run Tests	13m 29s
Functional tests (plus, v1.25.16) / Run Tests	14m 32s
Functional tests (plus, v1.32.3) / Run Tests	13m 47s
Conformance tests (nginx, v1.25.16, true) / Run Tests	7m 2s
Conformance tests (nginx, v1.25.16, false) / Run Tests	7m 33s
Conformance tests (nginx, v1.32.3, false) / Run Tests	7m 8s
Conformance tests (nginx, v1.32.3, true) / Run Tests	6m 47s
Conformance tests (plus, v1.25.16, false) / Run Tests	7m 0s
Conformance tests (plus, v1.25.16, true) / Run Tests	7m 0s
Conformance tests (plus, v1.32.3, false) / Run Tests	7m 10s
Conformance tests (plus, v1.32.3, true) / Run Tests	6m 57s
Package and Publish Helm Chart	0s
	2h 4m 42s

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