chore: bump thoth-proto to v0.5.0

* test(nginx-external-auth): bring up to code standards

Signed-off-by: Xe Iaso <me@xeiaso.net>

* fix(lib): close open redirect when in subrequest mode

Closes GHSA-cf57-c578-7jvv

Previously Anubis had an open redirect in subrequest auth mode due to an
insufficent fix in GHSA-jhjj-2g64-px7c. This patch adds additional
validation at several steps of the flow to prevent open redirects in
subrequest auth mode as well as implements automated testing to prevent
this from occuring in the future.

* docs: update CHANGELOG

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>

go.mod

@@ -3,7 +3,7 @@ module github.com/TecharoHQ/anubis
 go 1.24.2
 
 require (
-	github.com/TecharoHQ/thoth-proto v0.4.0
+	github.com/TecharoHQ/thoth-proto v0.5.0
 	github.com/a-h/templ v0.3.924
 	github.com/aws/aws-sdk-go-v2 v1.38.3
 	github.com/aws/aws-sdk-go-v2/config v1.31.6

go.sum

@@ -37,6 +37,8 @@ github.com/Songmu/gitconfig v0.2.1 h1:cZsqELfMtxWVI8ovq17gbvsR4qLfoYLAiXy5GwtJWb
 github.com/Songmu/gitconfig v0.2.1/go.mod h1:XM4O3SoXFnli9Ql2G7qXK2Fg7LJwf7Hs8GLFEOJlzmM=
 github.com/TecharoHQ/thoth-proto v0.4.0 h1:UbkvfgCku0Dm1R6O4ug3HOsJNnE6F3wB8x+Dpw2lzFI=
 github.com/TecharoHQ/thoth-proto v0.4.0/go.mod h1:IcGnZt3iYUZQVEa0Lwk5l4ix0hCeXlWUV1TJMZvbWx0=
+github.com/TecharoHQ/thoth-proto v0.5.0 h1:Fa663s4soYiURSU8MfW9tZ2wF+LsCRSaYmjUSyagfBM=
+github.com/TecharoHQ/thoth-proto v0.5.0/go.mod h1:C/U7FqTxpVn4V/qebC/GcW32I0h9xzsmWehF27KFOJs=
 github.com/TecharoHQ/yeet v0.6.3 h1:Iev6TYt/tpFYU73kbkNIYjCObYTvlihtby+htGF4Us8=
 github.com/TecharoHQ/yeet v0.6.3/go.mod h1:ltt+PWPjnvmQJxEHsdJ5K9u3GoWK83vSLWCCp8XbxqI=
 github.com/a-h/parse v0.0.0-20250122154542-74294addb73e h1:HjVbSQHy+dnlS6C3XajZ69NYAb5jbGNfHanvm1+iYlo=