Bump Go version to 1.23.6 (#30242)

* Bump Go version to 1.23.6

* Update CodeQL Github action as well

* Use server's Go version for CodeQL action

Co-authored-by: Antonis Stamatiou <stamatiou.antonis@gmail.com>

* Empty commit to trigger CI

* Bump golangci-lint to a version supporting Go 1.23

* Fix golangci-lint warnings

Several rules from gosimple, revive and staticcheck linters were
failing:
- Redefinition of built-in identifiers (max, min, new, recover...)
- Use of printf-like functions with simple strings
- Check for nil slices, when len already takes it into account

---------

Co-authored-by: Antonis Stamatiou <stamatiou.antonis@gmail.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/Makefile

@@ -284,7 +284,7 @@ else
 endif
 
 golangci-lint: ## Run golangci-lint on codebase
-	$(GO) install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.57.1
+	$(GO) install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.64.5
 
 	@echo Running golangci-lint
 	$(GOBIN)/golangci-lint run ./...