cmd/gorelease: fix tests by removing erroneously added type

Change-Id: Iba3eefd15e2ff4a8594b09dc38243f9e107c1586
Reviewed-on: https://go-review.googlesource.com/c/exp/+/411374
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Jonathan Amsterdam <[email protected]>
Run-TryBot: Jean de Klerk <[email protected]>

Author: jeanbza

cmd/gorelease/testdata/mod/example.com_generics_v0.0.1.txt

@@ -5,10 +5,6 @@ go 1.18
 -- a/a.go --
 package a
 
-type Urk[T any] interface {
-    Value() T
-}
-
 type Foo[V any] interface {
     Value() V
 }