CI: no need to install commitlint in TS build

However, we still need to install the types lib, otherwise
we would get this compiler error:

```
commitlint.config.ts(3,36): error TS2307: Cannot find module '@commitlint/types' or its corresponding type declarations.
```

Author: knocte

.github/workflows/CI.yml

@@ -87,19 +87,17 @@ jobs:
           git --version
           node --version
           npm --version
-      - name: Install commitlint
-        run: |
-          npm install conventional-changelog-conventionalcommits commitlint@latest
       - name: Install yarn
         run: |
           npm install --global yarn
           yarn add --dev jest typescript ts-jest @types/jest
+      - name: Install commitlint dependencies
+        run: npm install @commitlint/types
       - name: Print versions
         run: |
           git --version
           node --version
           npm --version
-          npx commitlint --version
       - name: Run typescript compiler
         run: npx tsc
 
@@ -119,23 +117,25 @@ jobs:
           sudo apt install --yes --no-install-recommends git ca-certificates
 
           sudo apt install --yes --no-install-recommends npm curl
-      - name: Install commitlint
-        run: |
-          npm install conventional-changelog-conventionalcommits commitlint@latest
       - name: Install yarn
         run: |
           npm install --global yarn
           yarn add --dev jest typescript ts-jest @types/jest ts-node
+      - name: Install commitlint dependencies
+        run: npm install @commitlint/types
       - name: Run typescript compiler
         run: npx tsc
       - name: Print versions
         run: |
           git --version
           node --version
           npm --version
-          npx commitlint --version
           yarn --version
           npx tsc --version
+      - name: Install commitlint
+        run: |
+          npm install conventional-changelog-conventionalcommits commitlint@latest
+          ./node_modules/commitlint/cli.js --version
       - name: Run tests to validate our plugins
         run: yarn jest --config jest.config.ts