Update Nu to 0.101.0 for workflow and ping ubuntu-latest to 22.04 for riscv64gc build (#14835)

- [x] Update Nu to 0.101.0 for release and nightly-build workflow, test
successfully in the nightly repo for a while, e.g.:
https://github.com/nushell/nightly/actions/runs/12779907140
- [x] Pin `ubuntu-latest` to `ubuntu-22.04` for riscv64gc build due to
[Ubuntu-latest workflows will use Ubuntu-24.04
image](actions/runner-images#10636)
- [x] Stabilize `hustcer/milestone-action@main` to
`hustcer/milestone-action@v2`

Author: hustcer

.github/workflows/milestone.yml

@@ -22,7 +22,7 @@ jobs:
 
       # Bind milestone to closed issue that has a merged PR fix
       - name: Set Milestone for Issue
-        uses: hustcer/milestone-action@main
+        uses: hustcer/milestone-action@v2
         if: github.event.issue.state == 'closed'
         with:
           action: bind-issue

.github/workflows/nightly-build.yml

@@ -39,7 +39,7 @@ jobs:
         uses: hustcer/setup-nu@v3
         if: github.repository == 'nushell/nightly'
         with:
-          version: 0.98.0
+          version: 0.101.0
 
       # Synchronize the main branch of nightly repo with the main branch of Nushell official repo
       - name: Prepare for Nightly Release
@@ -114,7 +114,7 @@ jobs:
         - target: armv7-unknown-linux-musleabihf
           os: ubuntu-22.04
         - target: riscv64gc-unknown-linux-gnu
-          os: ubuntu-latest
+          os: ubuntu-22.04
         - target: loongarch64-unknown-linux-gnu
           os: ubuntu-22.04
 
@@ -139,7 +139,7 @@ jobs:
     - name: Setup Nushell
       uses: hustcer/setup-nu@v3
       with:
-        version: 0.98.0
+        version: 0.101.0
 
     - name: Release Nu Binary
       id: nu
@@ -197,7 +197,7 @@ jobs:
       - name: Setup Nushell
         uses: hustcer/setup-nu@v3
         with:
-          version: 0.98.0
+          version: 0.101.0
 
       # Keep the last a few releases
       - name: Delete Older Releases

.github/workflows/release.yml

@@ -66,7 +66,7 @@ jobs:
         - target: armv7-unknown-linux-musleabihf
           os: ubuntu-22.04
         - target: riscv64gc-unknown-linux-gnu
-          os: ubuntu-latest
+          os: ubuntu-22.04
         - target: loongarch64-unknown-linux-gnu
           os: ubuntu-22.04
 
@@ -89,7 +89,7 @@ jobs:
     - name: Setup Nushell
       uses: hustcer/setup-nu@v3
       with:
-        version: 0.98.0
+        version: 0.101.0
 
     - name: Release Nu Binary
       id: nu