Update to Go 1.21 and update static checkers

.gitlab-ci.yml

 golang:
-  image: golang:1.20-bullseye
+  image: golang:1.21-bullseye
   script:
     - apt-get update
     - apt-get install --no-install-recommends -y npm

ci/run

@@ -10,9 +10,9 @@ export PATH
 make
 
 # Additional static checks only run in CI
-go install honnef.co/go/tools/cmd/staticcheck@v0.4.3
+go install honnef.co/go/tools/cmd/staticcheck@v0.4.6
 staticcheck ./...
-go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.52.2
+go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.55.2
 golangci-lint run
 
 

go.mod

 module wolass
 
-go 1.20
+go 1.21
 
 require (
 	github.com/BurntSushi/toml v1.2.1