[chore] updates code.superseriousbusiness.org/oauth2/v4 to ssb-v4.5.3-1 (#4245)

A brief note on the above change: Go does not seem to like version tagging outside of `v?[0-9\.]` formatting, so it translates `ssb-v4.5.3-1` to `v4.5.4-0.20250606121655-9d54ef189d42` and as such sees it as a "downgrade" compared to the previous `v4.9.0`. which functionally isn't a problem, everything still behaves as it should, but it means people can't just run `go get repo@latest` for this particular dependency.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4245
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

vendor/code.superseriousbusiness.org/oauth2/v4/models/token.go

@@ -1,6 +1,7 @@
 package models
 
 import (
+	"net/url"
 	"time"
 
 	"code.superseriousbusiness.org/oauth2/v4"
@@ -8,7 +9,7 @@ import (
 
 // NewToken create to token model instance
 func NewToken() *Token {
-	return &Token{}
+	return &Token{Extension: make(url.Values)}
 }
 
 // Token token model
@@ -28,6 +29,7 @@ type Token struct {
 	Refresh             string        `bson:"Refresh"`
 	RefreshCreateAt     time.Time     `bson:"RefreshCreateAt"`
 	RefreshExpiresIn    time.Duration `bson:"RefreshExpiresIn"`
+	Extension           url.Values    `bson:"Extension"`
 }
 
 // New create to token model instance
@@ -184,3 +186,13 @@ func (t *Token) GetRefreshExpiresIn() time.Duration {
 func (t *Token) SetRefreshExpiresIn(exp time.Duration) {
 	t.RefreshExpiresIn = exp
 }
+
+// GetExtension extension of token
+func (t *Token) GetExtension() url.Values {
+	return t.Extension
+}
+
+// SetExtension set extension of token
+func (t *Token) SetExtension(e url.Values) {
+	t.Extension = e
+}