vcpkg: sort triplets and restore local opus port for 1.5.1 (#8585)

* ci/flutter-build: Sort out triplets in job matrices

Signed-off-by: Vasyl Gello <vasek.gello@gmail.com>

* Restore local port for opus 1.5.1

Signed-off-by: Vasyl Gello <vasek.gello@gmail.com>

---------

Signed-off-by: Vasyl Gello <vasek.gello@gmail.com>

res/vcpkg/opus/vcpkg.json

@@ -0,0 +1,22 @@
+{
+  "name": "opus",
+  "version": "1.5.1",
+  "description": "Totally open, royalty-free, highly versatile audio codec",
+  "homepage": "https://github.com/xiph/opus",
+  "license": "BSD-3-Clause",
+  "dependencies": [
+    {
+      "name": "vcpkg-cmake",
+      "host": true
+    },
+    {
+      "name": "vcpkg-cmake-config",
+      "host": true
+    }
+  ],
+  "features": {
+    "avx2": {
+      "description": "Builds the library with avx2 instruction set"
+    }
+  }
+}