update haproxy classifier

[witchcraze]

This PR updates a binary cataloger for haproxy
Fixes #3233

$ go run cmd/syft/main.go -q haproxy:1.8-rc | grep haproxy
haproxy                 1.8-rc4                binary

$ go run cmd/syft/main.go -q haproxy:2.0-dev4 | grep haproxy
haproxy                 2.0-dev4               binary

$ go run cmd/syft/main.go -q haproxy:2.0.0 | grep haproxy
haproxy                 2.0.0                  binary

$ go run cmd/syft/main.go -q haproxy:2.1.0 | grep haproxy
haproxy                 2.1.0                   binary

$ go run cmd/syft/main.go -q haproxy:2.2-rc | grep haproxy
haproxy                 2.2-dev12               binary

$ go run cmd/syft/main.go -q haproxy:2.2.0 | grep haproxy
haproxy                 2.2.0                   binary

$ go run cmd/syft/main.go -q haproxy:2.3-rc | grep haproxy
haproxy                 2.3-dev0                binary