Fix CI (#122)

Author: curquiza

.github/workflows/pre-release-tests.yml

@@ -17,10 +17,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: rustup update
-      run: rustup update
-    - name: cargo version
-      run: cargo --version
     - name: Build
       run: cargo build --verbose
     - name: Get the latest MeiliSearch RC

.github/workflows/tests.yml

@@ -18,7 +18,7 @@ jobs:
     # Will still run for each push to bump-meilisearch-v*
     if: github.event_name != 'pull_request' || !startsWith(github.base_ref, 'bump-meilisearch-v')
     name: integration-tests
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
     - name: Build