Update Vendors (#337)

* update & migrate gitea sdk (Fix Delete Tag Issue)
* upgraded github.com/AlecAivazis/survey v2.2.7 => v2.2.8
* upgraded github.com/adrg/xdg v0.2.3 => v0.3.1
* upgraded github.com/araddon/dateparse
* upgraded github.com/olekukonko/tablewriter v0.0.4 => v0.0.5
* upgraded gopkg.in/yaml.v2 v2.3.0 => v2.4.0

Reviewed-on: https://gitea.com/gitea/tea/pulls/337
Reviewed-by: Norwin <noerw@noreply.gitea.io>
Reviewed-by: khmarbaise <khmarbaise@noreply.gitea.io>
Co-authored-by: 6543 <6543@obermui.de>
Co-committed-by: 6543 <6543@obermui.de>

vendor/github.com/aymerick/douceur/css/stylesheet.go

@@ -1,25 +0,0 @@
-package css
-
-// Stylesheet represents a parsed stylesheet
-type Stylesheet struct {
-	Rules []*Rule
-}
-
-// NewStylesheet instanciate a new Stylesheet
-func NewStylesheet() *Stylesheet {
-	return &Stylesheet{}
-}
-
-// Returns string representation of the Stylesheet
-func (sheet *Stylesheet) String() string {
-	result := ""
-
-	for _, rule := range sheet.Rules {
-		if result != "" {
-			result += "\n"
-		}
-		result += rule.String()
-	}
-
-	return result
-}