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/gorilla/css/scanner/doc.go

@@ -1,33 +0,0 @@
-// Copyright 2012 The Gorilla Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-/*
-Package gorilla/css/scanner generates tokens for a CSS3 input.
-
-It follows the CSS3 specification located at:
-
-	http://www.w3.org/TR/css3-syntax/
-
-To use it, create a new scanner for a given CSS string and call Next() until
-the token returned has type TokenEOF or TokenError:
-
-	s := scanner.New(myCSS)
-	for {
-		token := s.Next()
-		if token.Type == scanner.TokenEOF || token.Type == scanner.TokenError {
-			break
-		}
-		// Do something with the token...
-	}
-
-Following the CSS3 specification, an error can only occur when the scanner
-finds an unclosed quote or unclosed comment. In these cases the text becomes
-"untokenizable". Everything else is tokenizable and it is up to a parser
-to make sense of the token stream (or ignore nonsensical token sequences).
-
-Note: the scanner doesn't perform lexical analysis or, in other words, it
-doesn't care about the token context. It is intended to be used by a
-lexer or parser.
-*/
-package scanner