Update actions/stale action to v9.1.0 #10708

Job	Run time
Checks and variables	1m 35s
NJS Unit Tests	12s
Unit Tests	52s
Build Binary	27s
Build Plus images / build	57s
Build OSS images (nginx, linux/arm64, linux/amd64) / build	54s
Build OSS images (ngf, linux/arm64, linux/amd64) / build	1m 26s
Helm Tests	0s
Conformance tests (nginx, v1.25.16, false) / Run Tests	5m 29s
Conformance tests (nginx, v1.25.16, true) / Run Tests	5m 55s
Conformance tests (nginx, v1.32.0, false) / Run Tests	4m 36s
Conformance tests (nginx, v1.32.0, true) / Run Tests	4m 42s
Conformance tests (plus, v1.25.16, false) / Run Tests	5m 38s
Conformance tests (plus, v1.25.16, true) / Run Tests	5m 17s
Conformance tests (plus, v1.32.0, false) / Run Tests	5m 13s
Conformance tests (plus, v1.32.0, true) / Run Tests	5m 24s
Functional tests (nginx, v1.25.16) / Run Tests	13m 35s
Functional tests (nginx, v1.32.0) / Run Tests	12m 0s
Package and Publish Helm Chart	0s
Functional tests (plus, v1.25.16) / Run Tests	13m 4s
Functional tests (plus, v1.32.0) / Run Tests	12m 46s
	1h 40m 2s

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