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.

internal/cmdtest/test_cmd.go

@@ -83,7 +83,7 @@ func (tt *TestCmd) Run(name string, args ...string) {
 // InputLine writes the given text to the child's stdin.
 // This method can also be called from an expect template, e.g.:
 //
-//     geth.expect(`Passphrase: {{.InputLine "password"}}`)
+//	geth.expect(`Passphrase: {{.InputLine "password"}}`)
 func (tt *TestCmd) InputLine(s string) string {
 	io.WriteString(tt.stdin, s+"\n")
 	return ""

internal/ethapi/api.go

@@ -731,10 +731,10 @@ func (s *BlockChainAPI) GetHeaderByHash(ctx context.Context, hash common.Hash) m
 }
 
 // GetBlockByNumber returns the requested canonical block.
-// * When blockNr is -1 the chain head is returned.
-// * When blockNr is -2 the pending chain head is returned.
-// * When fullTx is true all transactions in the block are returned, otherwise
-//   only the transaction hash is returned.
+//   - When blockNr is -1 the chain head is returned.
+//   - When blockNr is -2 the pending chain head is returned.
+//   - When fullTx is true all transactions in the block are returned, otherwise
+//     only the transaction hash is returned.
 func (s *BlockChainAPI) GetBlockByNumber(ctx context.Context, number rpc.BlockNumber, fullTx bool) (map[string]interface{}, error) {
 	block, err := s.b.BlockByNumber(ctx, number)
 	if block != nil && err == nil {

internal/flags/helpers.go

@@ -54,11 +54,11 @@ var migrationApplied = map[*cli.Command]struct{}{}
 //
 // Example:
 //
-//    geth account new --keystore /tmp/mykeystore --lightkdf
+//	geth account new --keystore /tmp/mykeystore --lightkdf
 //
 // is equivalent after calling this method with:
 //
-//    geth --keystore /tmp/mykeystore --lightkdf account new
+//	geth --keystore /tmp/mykeystore --lightkdf account new
 //
 // i.e. in the subcommand Action function of 'account new', ctx.Bool("lightkdf)
 // will return true even if --lightkdf is set as a global option.