[Vendor] update go-swagger v0.21.0 -> v0.25.0 (#12670)

* Update go-swagger

* vendor

vendor/github.com/spf13/cast/.travis.yml

@@ -4,6 +4,7 @@ env:
 sudo: required
 go:
   - "1.11.x"
+  - "1.12.x"
   - tip
 os:
   - linux

vendor/github.com/spf13/cast/Makefile

@@ -1,4 +1,4 @@
-# A Self-Documenting Makefile: http://marmelab.com/blog/2016/02/29/auto-documented-makefile.html
+GOVERSION := $(shell go version | cut -d ' ' -f 3 | cut -d '.' -f 2)
 
 .PHONY: check fmt lint test test-race vet test-cover-html help
 .DEFAULT_GOAL := help
@@ -12,11 +12,13 @@ test-race: ## Run tests with race detector
 	go test -race ./...
 
 fmt: ## Run gofmt linter
+ifeq "$(GOVERSION)" "12"
 	@for d in `go list` ; do \
 		if [ "`gofmt -l -s $$GOPATH/src/$$d | tee /dev/stderr`" ]; then \
 			echo "^ improperly formatted go files" && echo && exit 1; \
 		fi \
 	done
+endif
 
 lint: ## Run golint linter
 	@for d in `go list` ; do \

vendor/github.com/spf13/cast/caste.go

@@ -819,15 +819,15 @@ func ToStringE(i interface{}) (string, error) {
 	case int8:
 		return strconv.FormatInt(int64(s), 10), nil
 	case uint:
-		return strconv.FormatInt(int64(s), 10), nil
+		return strconv.FormatUint(uint64(s), 10), nil
 	case uint64:
-		return strconv.FormatInt(int64(s), 10), nil
+		return strconv.FormatUint(uint64(s), 10), nil
 	case uint32:
-		return strconv.FormatInt(int64(s), 10), nil
+		return strconv.FormatUint(uint64(s), 10), nil
 	case uint16:
-		return strconv.FormatInt(int64(s), 10), nil
+		return strconv.FormatUint(uint64(s), 10), nil
 	case uint8:
-		return strconv.FormatInt(int64(s), 10), nil
+		return strconv.FormatUint(uint64(s), 10), nil
 	case []byte:
 		return string(s), nil
 	case template.HTML: