Upgrade Chromium in the CI flows to avoid flaking (#234)

Author: andybalaam

.github/workflows/single_sdk_tests.yml

@@ -37,6 +37,10 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
+      - name: Setup | Chromium
+        run: |
+          sudo apt-get -qq update
+          sudo apt-get -qq -y install chromium-browser
       - name: Resolve branches
         shell: bash
         # these env vars will be modified and used in subsequent steps

.github/workflows/tests.yaml

@@ -50,6 +50,10 @@ jobs:
         run: |
           rustup toolchain install stable
           rustup default stable
+      - name: Setup | Chromium
+        run: |
+          sudo apt-get -qq update
+          sudo apt-get -qq -y install chromium-browser
       - name: Checkout matrix-rust-sdk
         run: |
           BRANCH=$(./.github/workflows/resolve_branch.sh matrix-org/matrix-rust-sdk)