refactor(gh-actions/update-{flake-lock,flake-packages}): Switch to self-hosted runners

Author: PetarKirov

.github/workflows/update-flake-lock.yml

@@ -17,7 +17,7 @@ on:
 
 jobs:
   main:
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/update-flake-packages.yml

@@ -17,7 +17,7 @@ on:
 
 jobs:
   updateFlakePackages:
-    runs-on: ubuntu-latest
+    runs-on: self-hosted
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4