CI: Fix bats not found when installed via npm

Windows and Linux go a newer version ( v18.20.3) with npm 10.7 (instead of 10.5)

.github/workflows/tests.yml

@@ -89,6 +89,8 @@ jobs:
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
+        with:
+          node-version: v18.20.2 
       - run: npm pack ./
       - run: sudo npm install --loglevel verbose -g ./bats-*.tgz
       - name: Run test on OS ${{ matrix.os }}
@@ -115,6 +117,8 @@ jobs:
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
+        with:
+          node-version: v18.20.2 
       - run: npm pack ./
       - run: npm install -g (get-item .\bats-*.tgz).FullName
       - run: bats  -T --print-output-on-failure test
@@ -160,6 +164,8 @@ jobs:
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
       - uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
+        with:
+          node-version: v18.20.2 
       - name: Install unbuffer via expect
         run: brew install expect
       - name: Run test on OS ${{ matrix.os }}