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/opendrive/opendrive.go

@@ -491,7 +491,7 @@ func (f *Fs) Move(ctx context.Context, src fs.Object, remote string) (fs.Object,
 		Method: "POST",
 		Path:   "/file/move_copy.json",
 	}
-	var request interface{} = moveCopyFileData
+	var request any = moveCopyFileData
 
 	// use /file/rename.json if moving within the same directory
 	_, srcDirID, err := srcObj.fs.dirCache.FindPath(ctx, srcObj.remote, false)
@@ -564,7 +564,7 @@ func (f *Fs) DirMove(ctx context.Context, src fs.Fs, srcRemote, dstRemote string
 		Method: "POST",
 		Path:   "/folder/move_copy.json",
 	}
-	var request interface{} = moveFolderData
+	var request any = moveFolderData
 
 	// use /folder/rename.json if moving within the same parent directory
 	if srcDirectoryID == dstDirectoryID {
@@ -1042,10 +1042,7 @@ func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, op
 	chunkCounter := 0
 
 	for remainingBytes > 0 {
-		currentChunkSize := int64(o.fs.opt.ChunkSize)
-		if currentChunkSize > remainingBytes {
-			currentChunkSize = remainingBytes
-		}
+		currentChunkSize := min(int64(o.fs.opt.ChunkSize), remainingBytes)
 		remainingBytes -= currentChunkSize
 		fs.Debugf(o, "Uploading chunk %d, size=%d, remain=%d", chunkCounter, currentChunkSize, remainingBytes)