shell.nix: update Go toolchain to 1.19

Signed-off-by: Tom DNetto <tom@tailscale.com>

shell.nix

@@ -12,8 +12,8 @@
 
 {
 	pkgs ? import <nixpkgs> {},
-	tailscale-go-rev ? "710a0d861098c07540ad073bb73a42ce81bf54a8",
-	tailscale-go-sha ? "sha256-hnyddxiyqMFHGwV3I4wkBcYNd56schYFi0SL5/0PnMI=",
+	tailscale-go-rev ? "fabd769a3703c88780c5a7fb543577992d5074d1",
+	tailscale-go-sha ? "sha256-BvwZ/90izw0Ip3lh8eNkJvU46LKnOOhEXF0axkBi/Es=",
 }:
 let
 	tailscale-go = pkgs.lib.overrideDerivation pkgs.go_1_18 (attrs: rec {
@@ -28,6 +28,10 @@ let
 		nativeBuildInputs = attrs.nativeBuildInputs ++ [ pkgs.git ];
 		# Remove dependency on xcbuild as that causes iOS/macOS builds to fail.
 		propagatedBuildInputs = [];
+		# Remove custom nix patches, which are all related to fixing up
+		# tests. Some don't apply cleanly in 1.19.
+		# TODO: revert this once nix upstream has formal 1.19 support.
+		patches = [];
 		checkPhase = "";
 		# Our forked tailscale reads this env var to embed the git hash
 		# into the Go build version.