Remove obsolete Go build tags (#989)

A new Go build tag syntax in the form `//go:build` was added in Go 1.17.
In Go 1.18, this new syntax replaced the old syntax, which used the form
`// +build`. The fabric-gateway code retained both build tags for
backwards compatibility. Since the minimum supported Go version is now
1.24, the old format is obsolete and now flags a linting error. This
change removes the old style build tags.

Signed-off-by: Mark S. Lewis <[email protected]>

Author: bestbeforetoday

pkg/identity/hsmsign.go

@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: Apache-2.0
 
 //go:build pkcs11
-// +build pkcs11
 
 package identity
 

pkg/identity/hsmsign_test.go

@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: Apache-2.0
 
 //go:build pkcs11
-// +build pkcs11
 
 package identity