Fix nil pointer dereference and increase timeout

[yahavi]

Fix this error:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x18 pc=0x1007c8900]

goroutine 1 [running]:
main.runInRetryLoop(0x100915ee8, {0x1007dc55d, 0x27})
	/Users/runner/go/pkg/mod/github.com/jfrog/jfrog-testing-infra/[email protected]/main.go:261 +0x1c0
main.generateAccessToken()
	/Users/runner/go/pkg/mod/github.com/jfrog/jfrog-testing-infra/[email protected]/main.go:324 +0x88
main.setupLocalArtifactory()
	/Users/runner/go/pkg/mod/github.com/jfrog/jfrog-testing-infra/[email protected]/main.go:135 +0x3a0
main.main()
	/Users/runner/go/pkg/mod/github.com/jfrog/jfrog-testing-infra/[email protected]/main.go:56 +0x1c
Error: Process completed with exit code 2.

[noyshabtay]

LGTM