build: upgrade to go 1.19 (#25726)

This changes the CI / release builds to use the latest Go version. It also
upgrades golangci-lint to a newer version compatible with Go 1.19.

In Go 1.19, godoc has gained official support for links and lists. The
syntax for code blocks in doc comments has changed and now requires a
leading tab character. gofmt adapts comments to the new syntax
automatically, so there are a lot of comment re-formatting changes in this
PR. We need to apply the new format in order to pass the CI lint stage with
Go 1.19.

With the linter upgrade, I have decided to disable 'gosec' - it produces
too many false-positive warnings. The 'deadcode' and 'varcheck' linters
have also been removed because golangci-lint warns about them being
unmaintained. 'unused' provides similar coverage and we already have it
enabled, so we don't lose much with this change.

eth/tracers/native/4byte.go

@@ -37,14 +37,15 @@ func init() {
 // a reversed signature can be matched against the size of the data.
 //
 // Example:
-//   > debug.traceTransaction( "0x214e597e35da083692f5386141e69f47e973b2c56e7a8073b1ea08fd7571e9de", {tracer: "4byteTracer"})
-//   {
-//     0x27dc297e-128: 1,
-//     0x38cc4831-0: 2,
-//     0x524f3889-96: 1,
-//     0xadf59f99-288: 1,
-//     0xc281d19e-0: 1
-//   }
+//
+//	> debug.traceTransaction( "0x214e597e35da083692f5386141e69f47e973b2c56e7a8073b1ea08fd7571e9de", {tracer: "4byteTracer"})
+//	{
+//	  0x27dc297e-128: 1,
+//	  0x38cc4831-0: 2,
+//	  0x524f3889-96: 1,
+//	  0xadf59f99-288: 1,
+//	  0xc281d19e-0: 1
+//	}
 type fourByteTracer struct {
 	env               *vm.EVM
 	ids               map[string]int   // ids aggregates the 4byte ids found

eth/tracers/native/tracer.go

@@ -14,24 +14,20 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-/*
-Package native is a collection of tracers written in go.
-
-In order to add a native tracer and have it compiled into the binary, a new
-file needs to be added to this folder, containing an implementation of the
-`eth.tracers.Tracer` interface.
-
-Aside from implementing the tracer, it also needs to register itself, using the
-`register` method -- and this needs to be done in the package initialization.
-
-Example:
-
-```golang
-func init() {
-	register("noopTracerNative", newNoopTracer)
-}
-```
-*/
+// Package native is a collection of tracers written in go.
+//
+// In order to add a native tracer and have it compiled into the binary, a new
+// file needs to be added to this folder, containing an implementation of the
+// `eth.tracers.Tracer` interface.
+//
+// Aside from implementing the tracer, it also needs to register itself, using the
+// `register` method -- and this needs to be done in the package initialization.
+//
+// Example:
+//
+//	func init() {
+//		register("noopTracerNative", newNoopTracer)
+//	}
 package native
 
 import (