[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/model.go

@@ -1,6 +1,7 @@
 package oauth2
 
 import (
+	"net/url"
 	"time"
 )
 
@@ -10,6 +11,7 @@ type (
 		GetID() string
 		GetSecret() string
 		GetDomain() string
+		IsPublic() bool
 		GetUserID() string
 	}
 
@@ -56,4 +58,10 @@ type (
 		GetRefreshExpiresIn() time.Duration
 		SetRefreshExpiresIn(time.Duration)
 	}
+
+	ExtendableTokenInfo interface {
+		TokenInfo
+		GetExtension() url.Values
+		SetExtension(url.Values)
+	}
 )