Renamed version artifacts for centos from pr to mr

.github/workflows/build_artifacts.yml

@@ -57,7 +57,7 @@ jobs:
         # We use "mr" instead of "pr" to denote pull request builds, as this prefix comes before "nightly" when lexically
         # sorting packages by version. This means that when installing the package without specifying a version the
         # nighly version is considered more current than mr versions and installed by default
-        run: sed -i -e 's/^version = "\([0-9]\+\.[0-9]\+\.[0-9]\+\).*/version = "\1-pr${{ github.event.number }}"/' Cargo.toml
+        run: sed -i -e 's/^version = "\([0-9]\+\.[0-9]\+\.[0-9]\+\).*/version = "\1-mr${{ github.event.number }}"/' Cargo.toml
       - name: Build
         run: ~/.cargo/bin/cargo +nightly build --verbose --release
       - name: Build RPM package