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

fs/log/caller_hook.go

@@ -77,7 +77,7 @@ func (h *CallerHook) Fire(entry *logrus.Entry) error {
 func findCaller(skip int) string {
 	file := ""
 	line := 0
-	for i := 0; i < 10; i++ {
+	for i := range 10 {
 		file, line = getCaller(skip + i)
 		if !strings.HasPrefix(file, "logrus") && !strings.Contains(file, "log.go") {
 			break

fs/log/log.go

@@ -78,13 +78,13 @@ func fnName() string {
 // function that logs the exit parameters.
 //
 // Any pointers in the exit function will be dereferenced
-func Trace(o interface{}, format string, a ...interface{}) func(string, ...interface{}) {
+func Trace(o any, format string, a ...any) func(string, ...any) {
 	if fs.GetConfig(context.Background()).LogLevel < fs.LogLevelDebug {
-		return func(format string, a ...interface{}) {}
+		return func(format string, a ...any) {}
 	}
 	name := fnName()
 	fs.LogPrintf(fs.LogLevelDebug, o, name+": "+format, a...)
-	return func(format string, a ...interface{}) {
+	return func(format string, a ...any) {
 		for i := range a {
 			// read the values of the pointed to items
 			typ := reflect.TypeOf(a[i])
@@ -103,7 +103,7 @@ func Trace(o interface{}, format string, a ...interface{}) func(string, ...inter
 }
 
 // Stack logs a stack trace of callers with the o and info passed in
-func Stack(o interface{}, info string) {
+func Stack(o any, info string) {
 	if fs.GetConfig(context.Background()).LogLevel < fs.LogLevelDebug {
 		return
 	}