fix(migrations): update gitea sdk to fix nil pointer panic (#39999)

`gitea.dev/sdk` v1.2.0 loses the error of a failed server version lookup
after the first call, so Gitea-to-Gitea migrations panic on the next
version check. v1.3.0 (https://gitea.com/gitea/go-sdk/pulls/855) keeps
returning the error. `main` already has v1.3.0 via
https://github.com/go-gitea/gitea/pull/39742.

Fixes: https://github.com/go-gitea/gitea/issues/39989

go.mod

@@ -13,7 +13,7 @@ require (
 	gitea.com/lunny/dingtalk_webhook v0.0.0-20171025031554-e3534c89ef96
 	gitea.com/lunny/levelqueue v0.4.2-0.20230414023320-3c0159fe0fe4
 	gitea.dev/actionslib v1.2.1
-	gitea.dev/sdk v1.2.0
+	gitea.dev/sdk v1.3.0
 	github.com/42wim/httpsig v1.2.4
 	github.com/42wim/sshsig v0.0.0-20260317195500-b9f38cf0d432
 	github.com/Azure/go-ntlmssp v0.1.1

go.sum

@@ -24,8 +24,8 @@ gitea.com/xorm/sqlfiddle v0.0.0-20180821085327-62ce714f951a h1:lSA0F4e9A2NcQSqGq
 gitea.com/xorm/sqlfiddle v0.0.0-20180821085327-62ce714f951a/go.mod h1:EXuID2Zs0pAQhH8yz+DNjUbjppKQzKFAn28TMYPB6IU=
 gitea.dev/actionslib v1.2.1 h1:GL//K/0zIZV6h1OOksv1awvFVg0rg7fug2xWcG7mkG0=
 gitea.dev/actionslib v1.2.1/go.mod h1:1+gqOKGSEPn2IFHgY8S3GC5Ld+Hn8jF3OxiFHQ/fpx4=
-gitea.dev/sdk v1.2.0 h1:avRtJl/nKCGispgSalo9czoZM9Rto1awnE0caNAoXGo=
-gitea.dev/sdk v1.2.0/go.mod h1:rfh5oNdIK24cbCREwIn1tqWKQW+IICXFGWJyebuOAOE=
+gitea.dev/sdk v1.3.0 h1:4U95+Ou6WHCQiRPDEyAzvl1Q7cxg5RUTWkqmOXr5w4I=
+gitea.dev/sdk v1.3.0/go.mod h1:85EBqSAqUn1KlFCk40y3sTjWjBsB/KouL3slGXMA/2o=
 github.com/42wim/httpsig v1.2.4 h1:mI5bH0nm4xn7K18fo1K3okNDRq8CCJ0KbBYWyA6r8lU=
 github.com/42wim/httpsig v1.2.4/go.mod h1:yKsYfSyTBEohkPik224QPFylmzEBtda/kjyIAJjh3ps=
 github.com/42wim/sshsig v0.0.0-20260317195500-b9f38cf0d432 h1:3Fcz1QzlS7Jv4FT2KI3cHNSZL+KPN3dXxurn9f3YL/Y=