multi: update linter, fix new issues

tools/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.19
+FROM golang:1.20
 
 RUN apt-get update && apt-get install -y git
 ENV GOCACHE=/tmp/build/.cache
@@ -10,7 +10,7 @@ RUN cd /tmp \
   && mkdir -p /tmp/build/.cache \
   && mkdir -p /tmp/build/.modcache \
   && cd /tmp/tools \
-  && go install -trimpath -tags=tools github.com/golangci/golangci-lint/cmd/golangci-lint \
+  && go install -trimpath github.com/golangci/golangci-lint/cmd/golangci-lint \
   && chmod -R 777 /tmp/build/ \
   && git config --global --add safe.directory /build