vendor: update elastic/gosigar so that it compiles on OpenBSD (#16542)

vendor/github.com/elastic/gosigar/sigar_openbsd.go

@@ -294,6 +294,10 @@ func (self *Swap) Get() error {
 	return nil
 }
 
+func (self *HugeTLBPages) Get() error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
 func (self *Cpu) Get() error {
 	load := [C.CPUSTATES]C.long{C.CP_USER, C.CP_NICE, C.CP_SYS, C.CP_INTR, C.CP_IDLE}
 
@@ -381,6 +385,10 @@ func (self *ProcFDUsage) Get(pid int) error {
 	return ErrNotImplemented{runtime.GOOS}
 }
 
+func (self *Rusage) Get(pid int) error {
+	return ErrNotImplemented{runtime.GOOS}
+}
+
 func fillCpu(cpu *Cpu, load [C.CPUSTATES]C.long) {
 	cpu.User = uint64(load[0])
 	cpu.Nice = uint64(load[1])