ci: upgrade pnpm to v7

Author: dangreen

.github/workflows/checks.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Install pnpm
         uses: pnpm/[email protected]
         with:
-          version: 6
+          version: 7
       - name: Install Node.js
         uses: actions/setup-node@v2
         with:
@@ -32,7 +32,7 @@ jobs:
       - name: Install pnpm
         uses: pnpm/[email protected]
         with:
-          version: 6
+          version: 7
       - name: Install Node.js
         uses: actions/setup-node@v2
         with:
@@ -54,7 +54,7 @@ jobs:
       - name: Install pnpm
         uses: pnpm/[email protected]
         with:
-          version: 6
+          version: 7
       - name: Install Node.js
         uses: actions/setup-node@v2
         with:

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Install pnpm
         uses: pnpm/[email protected]
         with:
-          version: 6
+          version: 7
       - name: Install Node.js
         uses: actions/setup-node@v2
         with:

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Install pnpm
         uses: pnpm/[email protected]
         with:
-          version: 6
+          version: 7
       - name: Install Node.js
         uses: actions/setup-node@v2
         with: