treewide: remove knl from maintainers

I have no capacity at the moment to work on any of these
packages, that I don't use anymore.

pkgs/by-name/gr/grpcurl/package.nix

@@ -29,7 +29,7 @@ buildGoModule (finalAttrs: {
     description = "Like cURL, but for gRPC: Command-line tool for interacting with gRPC servers";
     homepage = "https://github.com/fullstorydev/grpcurl";
     license = lib.licenses.mit;
-    maintainers = with lib.maintainers; [ knl ];
+    maintainers = [ ];
     mainProgram = "grpcurl";
   };
 })

pkgs/by-name/is/isomd5sum/package.nix

@@ -41,6 +41,6 @@ stdenv.mkDerivation (finalAttrs: {
     description = "Utilities for working with md5sum implanted in ISO images";
     platforms = lib.platforms.linux;
     license = lib.licenses.gpl2Plus;
-    maintainers = with lib.maintainers; [ knl ];
+    maintainers = [ ];
   };
 })

pkgs/by-name/pr/prek/package.nix

@@ -56,6 +56,6 @@ rustPlatform.buildRustPackage (finalAttrs: {
     mainProgram = "prek";
     changelog = "https://github.com/j178/prek/blob/${finalAttrs.src.tag}/CHANGELOG.md";
     license = [ lib.licenses.mit ];
-    maintainers = [ lib.maintainers.knl ];
+    maintainers = [ ];
   };
 })

pkgs/by-name/re/refurb/package.nix

@@ -57,6 +57,6 @@ python3Packages.buildPythonApplication (finalAttrs: {
     mainProgram = "refurb";
     homepage = "https://github.com/dosisod/refurb";
     license = with lib.licenses; [ gpl3Only ];
-    maintainers = with lib.maintainers; [ knl ];
+    maintainers = [ ];
   };
 })

pkgs/by-name/ze/zed/package.nix

@@ -45,8 +45,6 @@ buildGoModule (finalAttrs: {
     homepage = "https://zed.brimdata.io";
     changelog = "https://github.com/brimdata/zed/blob/v${finalAttrs.version}/CHANGELOG.md";
     license = lib.licenses.bsd3;
-    maintainers = with lib.maintainers; [
-      knl
-    ];
+    maintainers = [ ];
   };
 })