update nixpkgs

bitcoind-knots: 29.3.knots20260210 -> 29.3.knots20260508
fulcrum: 1.12.0.1 -> 2.1.1
lightning-loop: 0.33.0-beta -> 0.33.2-beta
lnd: 0.20.1-beta -> 0.21.1-beta

flake.lock

@@ -44,11 +44,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1778737229,
+        "lastModified": 1782847189,
-        "narHash": "sha256-6xWoytx8jFW4PF1GjRm/i/53trbpKGfz6zjzQGBr4cI=",
+        "narHash": "sha256-twXPFqFsrrY5r28Zh7Homgcp2gUMBgQ6WDS98Q/3xFI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d7a713c0b7e47c908258e71cba7a2d77cc8d71d5",
+        "rev": "b6018f87da91d19d0ab4cf979885689b469cdd41",
         "type": "github"
       },
       "original": {
@@ -76,11 +76,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1778869304,
+        "lastModified": 1784453100,
-        "narHash": "sha256-30sZNZoA1cqF5JNO9fVX+wgiQYjB7HJqqJ4ztCDeBZE=",
+        "narHash": "sha256-zpGZb8FYui+i8KLtC0nlcmb0voR2zB80Qn8pe7lzIbk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d233902339c02a9c334e7e593de68855ad26c4cb",
+        "rev": "b471514bed69eff5255c8e63c1f80e5fe56c616f",
         "type": "github"
       },
       "original": {

pkgs/clnrest/default.nix

@@ -31,6 +31,13 @@ rustPlatform.buildRustPackage rec {
     protobuf
   ];
 
+  # `core::lsps2::htlc::tests::polls_until_channel_ready` (in the `cln-lsps`
+  # workspace member) is timing-dependent: it spawns a polling task, sleeps a
+  # real 10 ms, then asserts the loop ran more than once. Under the parallel
+  # test load in CI the spawned task gets starved and the assertion fails.
+  # Skip this single upstream test; the remaining workspace tests still run.
+  checkFlags = [ "--skip=polls_until_channel_ready" ];
+
   meta = with lib; {
     description = "REST plugin for clightning";
     homepage = "https://github.com/ElementsProject/lightning/tree/master/plugins/rest-plugin";

pkgs/pinned.nix

@@ -7,7 +7,6 @@ pkgs: pkgsUnstable: pkgs-25_05:
     charge-lnd
     electrs
     extra-container
-    fulcrum
     lightning-pool
     lndconnect;
 
@@ -17,6 +16,7 @@ pkgs: pkgsUnstable: pkgs-25_05:
     clboss
     clightning
     elementsd
+    fulcrum
     lightning-loop
     lnd;