Pull request 1796: 5661-opt-more-lock

Updates #5661.

Squashed commit of the following:

commit 0a1425df0ea1278c73ac88cbee053897d3daaf1b
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Mar 31 18:31:19 2023 +0300

    querylog: opt locks more

internal/querylog/querylogfile.go

@@ -167,8 +167,8 @@ func (l *queryLog) periodicRotate() {
 // checkAndRotate rotates log files if those are older than the specified
 // rotation interval.
 func (l *queryLog) checkAndRotate() {
-	l.lock.Lock()
-	defer l.lock.Unlock()
+	l.confMu.RLock()
+	defer l.confMu.RUnlock()
 
 	oldest, err := l.readFileFirstTimeValue()
 	if err != nil && !errors.Is(err, os.ErrNotExist) {