build: modernize Go usage

This commit modernizes Go usage. This was done with:

go run golang.org/x/tools/gopls/internal/analysis/modernize/cmd/modernize@latest -fix -test ./...

Then files needed to be `go fmt`ed and a few comments needed to be
restored.

The modernizations include replacing

- if/else conditional assignment by a call to the built-in min or max functions added in go1.21
- sort.Slice(x, func(i, j int) bool) { return s[i] < s[j] } by a call to slices.Sort(s), added in go1.21
- interface{} by the 'any' type added in go1.18
- append([]T(nil), s...) by slices.Clone(s) or slices.Concat(s), added in go1.21
- loop around an m[k]=v map update by a call to one of the Collect, Copy, Clone, or Insert functions from the maps package, added in go1.21
- []byte(fmt.Sprintf...) by fmt.Appendf(nil, ...), added in go1.19
- append(s[:i], s[i+1]...) by slices.Delete(s, i, i+1), added in go1.21
- a 3-clause for i := 0; i < n; i++ {} loop by for i := range n {}, added in go1.22

backend/oracleobjectstorage/command.go

@@ -131,7 +131,7 @@ If it is a string or a []string it will be shown to the user
 otherwise it will be JSON encoded and shown to the user like that
 */
 func (f *Fs) Command(ctx context.Context, commandName string, args []string,
-	opt map[string]string) (result interface{}, err error) {
+	opt map[string]string) (result any, err error) {
 	// fs.Debugf(f, "command %v, args: %v, opts:%v", commandName, args, opt)
 	switch commandName {
 	case operationRename:
@@ -159,7 +159,7 @@ func (f *Fs) Command(ctx context.Context, commandName string, args []string,
 	}
 }
 
-func (f *Fs) rename(ctx context.Context, remote, newName string) (interface{}, error) {
+func (f *Fs) rename(ctx context.Context, remote, newName string) (any, error) {
 	if remote == "" {
 		return nil, fmt.Errorf("path to object file cannot be empty")
 	}
@@ -332,7 +332,7 @@ func (f *Fs) listMultipartUploadParts(ctx context.Context, bucketName, bucketPat
 	return uploadedParts, nil
 }
 
-func (f *Fs) restore(ctx context.Context, opt map[string]string) (interface{}, error) {
+func (f *Fs) restore(ctx context.Context, opt map[string]string) (any, error) {
 	req := objectstorage.RestoreObjectsRequest{
 		NamespaceName:         common.String(f.opt.Namespace),
 		RestoreObjectsDetails: objectstorage.RestoreObjectsDetails{},