cmd/go/testdata/script: remove net condition from always skipped tests

mod_replace_gopkgin is unconditionally skipped, and there is an
unconditional skip in mod_replace_gopkgin. Remove the net condition
checks from these tests. We want to add an allowlist for the tests that
use net and make it as small as possible. Since these tests shouldn't
access the network once they're fixed and reenabled, just remove the
condition.

For #80243

Change-Id: I690e2668281901103b55f6d66eaa81816a6a6964
Reviewed-on: https://go-review.googlesource.com/c/go/+/795920
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Michael Matloob <matloob@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
diff --git a/src/cmd/go/testdata/script/mod_gopkg_unstable.txt b/src/cmd/go/testdata/script/mod_gopkg_unstable.txt
index 856f493..34e6de3 100644
--- a/src/cmd/go/testdata/script/mod_gopkg_unstable.txt
+++ b/src/cmd/go/testdata/script/mod_gopkg_unstable.txt
@@ -7,10 +7,9 @@
 cp go.mod.empty go.mod
 go list
 
-[!net:gopkg.in] skip
+skip  # TODO(#54503): redirect gopkg.in requests to a local server and re-enable.
 [!git] skip
 
-skip  # TODO(#54503): redirect gopkg.in requests to a local server and re-enable.
 
 env GOPROXY=direct
 env GOSUMDB=off
diff --git a/src/cmd/go/testdata/script/mod_replace_gopkgin.txt b/src/cmd/go/testdata/script/mod_replace_gopkgin.txt
index 91008f9..8d7de07 100644
--- a/src/cmd/go/testdata/script/mod_replace_gopkgin.txt
+++ b/src/cmd/go/testdata/script/mod_replace_gopkgin.txt
@@ -5,9 +5,7 @@
 # gopkg.in path.
 
 skip 'skipping test that depends on an unreliable third-party server; see https://go.dev/issue/54503'
-	# TODO(#54043): Make this test hermetic and re-enable it.
-
-[!net:gopkg.in] skip
+# TODO(#54503): Make this work without needing the external network, and then re-enable.
 [!git] skip
 
 env GO111MODULE=on