buf: init at 0.40.0

pkgs/development/tools/buf/skip_test_requiring_network.patch

@@ -0,0 +1,15 @@
+diff --git a/internal/buf/internal/buftesting/buftesting.go b/internal/buf/internal/buftesting/buftesting.go
+index dc8da0c..70ad299 100644
+--- a/internal/buf/internal/buftesting/buftesting.go
++++ b/internal/buf/internal/buftesting/buftesting.go
+@@ -100,6 +100,10 @@ func RunActualProtoc(
+ 
+ // GetGoogleapisDirPath gets the path to a clone of googleapis.
+ func GetGoogleapisDirPath(t *testing.T, buftestingDirPath string) string {
++	// Requires network access, which is not available during
++	// the nixpkgs sandboxed build
++	t.Skip()
++
+ 	googleapisDirPath := filepath.Join(buftestingDirPath, testGoogleapisDirPath)
+ 	require.NoError(
+ 		t,