[CI]: Replace deprecated actions/create-release and actions/upload-release-assert actions

[WojciechMazur]

Both of these actions were archived in 2021. In the future they're going to fail, due to deprecation of set-output command in GitHub actions.
We replace their usage with a single gh release create command. It also allows us to simplify the workflow

[skip ci]

[WojciechMazur]

We can potentially consider explicitly listing files to upload without using glob selectors, but it seems unnecessary:

          scala3-${{ env.RELEASE_TAG }}.zip \
          scala3-${{ env.RELEASE_TAG }}.zip.sha256 \
          scala3-${{ env.RELEASE_TAG }}.tar.gz.sha256 \
          scala3-${{ env.RELEASE_TAG }}-x86_64-pc-linux.zip \
          scala3-${{ env.RELEASE_TAG }}-x86_64-pc-linux.zip.sha256 \
          scala3-${{ env.RELEASE_TAG }}-x86_64-pc-linux.tar.gz \
          scala3-${{ env.RELEASE_TAG }}-x86_64-pc-linux.tar.gz.sha256 \
          scala3-${{ env.RELEASE_TAG }}-aarch64-pc-linux.zip \
          scala3-${{ env.RELEASE_TAG }}-aarch64-pc-linux.zip.sha256 \
          scala3-${{ env.RELEASE_TAG }}-aarch64-pc-linux.tar.gz \
          scala3-${{ env.RELEASE_TAG }}-aarch64-pc-linux.tar.gz.sha256 \
          scala3-${{ env.RELEASE_TAG }}-x86_64-apple-darwin.zip \
          scala3-${{ env.RELEASE_TAG }}-x86_64-apple-darwin.zip.sha256 \
          scala3-${{ env.RELEASE_TAG }}-x86_64-apple-darwin.tar.gz \
          scala3-${{ env.RELEASE_TAG }}-x86_64-apple-darwin.tar.gz.sha256 \
          scala3-${{ env.RELEASE_TAG }}-aarch64-apple-darwin.zip \
          scala3-${{ env.RELEASE_TAG }}-aarch64-apple-darwin.zip.sha256 \
          scala3-${{ env.RELEASE_TAG }}-aarch64-apple-darwin.tar.gz \
          scala3-${{ env.RELEASE_TAG }}-aarch64-apple-darwin.tar.gz.sha256 \
          scala3-${{ env.RELEASE_TAG }}-x86_64-pc-win32.zip \
          scala3-${{ env.RELEASE_TAG }}-x86_64-pc-win32.zip.sha256 \
          scala3-${{ env.RELEASE_TAG }}-x86_64-pc-win32.tar.gz \
          scala3-${{ env.RELEASE_TAG }}-x86_64-pc-win32.tar.gz.sha256 \
          scala3-${{ env.RELEASE_TAG }}.msi \
          scala3-${{ env.RELEASE_TAG }}.msi.sha256

[WojciechMazur]

The new approach was tested during 3.6.3-RC1 release: https://github.com/scala/scala3/actions/runs/12258476158/job/34204889698#step:15:1