go.mod: bump github.com/getkin/kin-openapi to v0.131.0

As deepmap/oapi-codegen didn't work with this newer version, upgrade to
oapi-codegen/oapi-codegen v2.

Mitigating CVE-2025-30153

vendor/github.com/oapi-codegen/runtime/Makefile

@@ -0,0 +1,32 @@
+GOBASE=$(shell pwd)
+GOBIN=$(GOBASE)/bin
+
+help:
+	@echo "This is a helper makefile for oapi-codegen"
+	@echo "Targets:"
+	@echo "    generate:    regenerate all generated files"
+	@echo "    test:        run all tests"
+	@echo "    gin_example  generate gin example server code"
+	@echo "    tidy         tidy go mod"
+
+$(GOBIN)/golangci-lint:
+	curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(GOBIN) v1.55.2
+
+.PHONY: tools
+tools: $(GOBIN)/golangci-lint
+
+lint: tools
+	$(GOBIN)/golangci-lint run ./...
+
+lint-ci: tools
+	$(GOBIN)/golangci-lint run ./... --out-format=github-actions --timeout=5m
+
+generate:
+	go generate ./...
+
+test:
+	go test -cover ./...
+
+tidy:
+	@echo "tidy..."
+	go mod tidy