Build fails with error "conversion from int to string yields a string of one rune"

[pinkavaj]

pkg/kfapp/aws/aws.go:564:74: conversion from int to string yields a string of one rune, not a string of digits (did you mean fmt.Sprint(x)?)

go version go1.15 linux/amd64

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platform/aws	0.81
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[jtfogarty]

/priority p1

[PatrickXYS]

I'm not sure if I understand, if we're not using go 1.15, there should be some issues when we upgrade go version in kfctl.

Let's take a step back, what's the reason that we need to upgrade go version for kfctl?