fix: github actions cause error when run 'npm install -g npm' to install the latest npm

Author: tiny-craft

.github/workflows/release-linux.yaml

@@ -53,7 +53,7 @@ jobs:
       - name: Build frontend assets
         shell: bash
         run: |
-          npm install -g npm
+          npm install -g npm@8
           jq '.info.productVersion = "${{ steps.normalise_version.outputs.version }}"' wails.json > tmp.json
           mv tmp.json wails.json
           cd frontend

.github/workflows/release-macos.yaml

@@ -59,7 +59,7 @@ jobs:
       - name: Build frontend assets
         shell: bash
         run: |
-          npm install -g npm
+          npm install -g npm@8
           jq '.info.productVersion = "${{ steps.normalise_version.outputs.version }}"' wails.json > tmp.json
           mv tmp.json wails.json
           cd frontend

.github/workflows/release-windows.yaml

@@ -52,7 +52,7 @@ jobs:
       - name: Build frontend assets
         shell: bash
         run: |
-          npm install -g npm
+          npm install -g npm@8
           jq '.info.productVersion = "${{ steps.normalise_version.outputs.version }}"' wails.json > tmp.json
           mv tmp.json wails.json
           cd frontend