chore: Bump actions/setup-node from 4.4.0 to 6.4.0

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 4.4.0 to 6.4.0.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@49933ea...48b55a0)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: 6.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/pr-checks.yml

@@ -280,7 +280,7 @@ jobs:
         run: .venv/Scripts/pytest tests/ -v -m "not live and not lint"
 
       - name: Set up Node.js 20
-        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020  # v4.4.0
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:
           node-version: "20"
 
@@ -373,7 +373,7 @@ jobs:
           python-version: "3.13"
 
       - name: Set up Node.js 20
-        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020  # v4.4.0
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:
           node-version: "20"
 
@@ -537,7 +537,7 @@ jobs:
           python-version: "3.13"
 
       - name: Set up Node.js 20
-        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020  # v4.4.0
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:
           node-version: "20"
 
@@ -776,7 +776,7 @@ jobs:
           python-version: "3.13"
 
       - name: Set up Node.js 20
-        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020  # v4.4.0
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:
           node-version: "20"