Revert ".github/workflows: Migrate workflows to Blacksmith runners (#74)"

This reverts commit 635cf65.

Author: alexng353

.github/workflows/cd.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   release-please:
-    runs-on: blacksmith-4vcpu-ubuntu-2404
+    runs-on: ubuntu-latest
     permissions:
       contents: write
       pull-requests: write
@@ -41,10 +41,10 @@ jobs:
       matrix:
         include:
           - target: x86_64-unknown-linux-gnu
-            os: blacksmith-4vcpu-ubuntu-2404
+            os: ubuntu-latest
 
           - target: x86_64-unknown-linux-musl
-            os: blacksmith-4vcpu-ubuntu-2404
+            os: ubuntu-latest
 
           # - target: i686-unknown-linux-musl
           #   os: ubuntu-latest

.github/workflows/rust.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [blacksmith-4vcpu-ubuntu-2404, macos-latest, windows-latest]
+        os: [ubuntu-latest, macos-latest, windows-latest]
         rust: [stable]
     steps:
       - uses: actions/checkout@v3