Windows build needs to be on a more recent Go version

[tianmiaohu-fis]

spruce v1.29.0 gives the below error when using the vault operator (op_vault.go) on Winodws (Windows 10):
Error during Vault client initialization: unable to retrieve system root certificate authorities: crypto/x509: system root pool is not available on Windows

I cloned the spruce source code and re-built it on "go version go1.18.3 windows/amd64" and the error no longer occurs.