Bump curlimages/curl from 8.3.0 to 8.8.0 in /tests/suite/manifests/longevity #6445

Job	Run time
Checks and variables	1m 55s
Unit Tests	2m 30s
NJS Unit Tests	11s
Build Binary	1m 49s
Build Plus images / build	55s
Build OSS images (ngf, linux/arm64, linux/amd64) / build	1m 2s
Build OSS images (nginx, linux/arm64, linux/amd64) / build	52s
Helm Tests	0s
Functional tests (nginx, v1.30.0) / Run Tests	10m 57s
Functional tests (nginx, v1.25.16) / Run Tests	11m 4s
Functional tests (plus, v1.25.16) / Run Tests	10m 39s
Conformance tests (nginx, v1.25.16, false) / Run Tests	7m 20s
Functional tests (plus, v1.30.0) / Run Tests	9m 47s
Conformance tests (nginx, v1.25.16, true) / Run Tests	7m 23s
Conformance tests (nginx, v1.30.0, false) / Run Tests	6m 32s
Conformance tests (nginx, v1.30.0, true) / Run Tests	6m 8s
Conformance tests (plus, v1.25.16, false) / Run Tests	6m 20s
Conformance tests (plus, v1.25.16, true) / Run Tests	7m 3s
Package and Publish Helm Chart	0s
Conformance tests (plus, v1.30.0, false) / Run Tests	7m 27s
Conformance tests (plus, v1.30.0, true) / Run Tests	5m 52s
	1h 45m 46s

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