Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows (#5)

* Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4.1.7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
...

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

* Update rfc-check.yml

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Brian Sipos <brian.sipos@gmail.com>

Author: dependabot[bot]

.github/workflows/rfc-check.yml

@@ -18,7 +18,7 @@ jobs:
         cmake -S . -B build -DCMAKE_INSTALL_DOCDIR=$PWD/build/install
         cmake --build build -v
         cmake --install build
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         name: spec
         path: build/install
@@ -29,7 +29,7 @@ jobs:
     needs: build
     steps:
     - uses: actions/checkout@v3
-    - uses: actions/download-artifact@v3
+    - uses: actions/download-artifact@v4.1.7
       with:
         name: spec
         path: build/install