chore: use npm ci --ignore-scripts everywhere (#699)

Like https://github.com/astral-sh/ruff-action/pull/276 🙂 

This also adds cooldown stanzas to the Dependabot updater rules: this
ensures that we only receive dependency bumps once they're at least a
week old, which should reduce the window of opportunity for an attacker
who temporarily compromises popular packages (like with "Shai-Hulud"
last week).

Signed-off-by: William Woodruff <william@astral.sh>

.github/workflows/test.yml

@@ -33,7 +33,7 @@ jobs:
           node-version-file: .nvmrc
           cache: npm
       - run: |
-          npm install
+          npm ci --ignore-scripts
       - run: |
           npm run all
       - name: Check all jobs are in all-tests-passed.needs

.github/workflows/update-known-versions.yml

@@ -39,7 +39,7 @@ jobs:
           fi
       - name: Compile changes
         if: ${{ steps.changes-exist.outputs.changes-exist == 'true' }}
-        run: npm ci && npm run all
+        run: npm ci --ignore-scripts && npm run all
       - name: Commit and push changes
         if: ${{ steps.changes-exist.outputs.changes-exist == 'true' }}
         id: commit-and-push