[Feat] Update zkvm to 0.6 (use openvm 1.4) (#1736)

.github/workflows/common.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: nightly-2025-02-14
+        toolchain: nightly-2025-08-18
         override: true
         components: rustfmt, clippy
     - name: Install Go

.github/workflows/coordinator.yml

@@ -33,7 +33,7 @@ jobs:
     steps:
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: nightly-2025-02-14
+        toolchain: nightly-2025-08-18
         override: true
         components: rustfmt, clippy
     - name: Install Go

.github/workflows/intermediate-docker.yml

@@ -22,11 +22,9 @@ on:
         required: true
         type: choice
         options:
-          - nightly-2023-12-03
-          - nightly-2022-12-10
           - 1.86.0
-          - nightly-2025-02-14
-        default: "nightly-2023-12-03"
+          - nightly-2025-08-18
+        default: "nightly-2025-08-18"
       PYTHON_VERSION:
         description: "Python version"
         required: false