Update docc plugin dependency

Package.resolved

@@ -0,0 +1,23 @@
+{
+  "pins" : [
+    {
+      "identity" : "swift-docc-plugin",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-docc-plugin",
+      "state" : {
+        "revision" : "85e4bb4e1cd62cec64a4b8e769dcefdf0c5b9d64",
+        "version" : "1.4.3"
+      }
+    },
+    {
+      "identity" : "swift-docc-symbolkit",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/swiftlang/swift-docc-symbolkit",
+      "state" : {
+        "revision" : "b45d1f2ed151d057b54504d653e0da5552844e34",
+        "version" : "1.0.0"
+      }
+    }
+  ],
+  "version" : 2
+}

Package.swift

@@ -8,7 +8,7 @@ let package = Package(
                  targets: ["FirebladeECS"])
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0")
+        .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.4.3")
     ],
     targets: [
         .target(name: "FirebladeECS",