fix: migrate to cloud.google.com/go/monitoring/apiv3/v2

[sspaink]

cloud.google.com/go/monitoring/apiv3 is deprecated and replaced by cloud.google.com/go/monitoring/apiv3/v2, monitoring.MetricProjectPath was also deprecated and replaced with fmt.Sprintf("projects/%s", s.Project). Both of these deprecation's were reported by the linter staticcheck.

[telegraf-tiger]

📦 Looks like new artifacts were built from this PR.

Expand this list to get them here! 🐯

Artifact URLs

DEB	RPM	TAR GZ	ZIP
amd64.deb	aarch64.rpm	darwin_amd64.tar.gz	windows_amd64.zip
arm64.deb	armel.rpm	freebsd_amd64.tar.gz	windows_i386.zip
armel.deb	armv6hl.rpm	freebsd_armv7.tar.gz
armhf.deb	linux_i386.tar.gzi386.rpm	freebsd_i386.tar.gz
i386.deb	ppc64le.rpm	linux_amd64.tar.gz
mips.deb	s390x.rpm	linux_arm64.tar.gz
mipsel.deb	x86_64.rpm	linux_armel.tar.gz
ppc64el.deb		linux_armhf.tar.gz
s390x.deb		linux_mips.tar.gz
		linux_mipsel.tar.gz
		linux_ppc64le.tar.gz
		linux_s390x.tar.gz
		static_linux_amd64.tar.gz

[Hipska]

Looks good. Only question if mod.go doesn't need to be updated?

[sspaink]

@Hipska thanks for reviewing this, I was also surprised there wasn't a go.mod change but looks like v2 is imported by cloud.google.com/go/monitoring v0.2.0 as well.