.github: bump actions

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

.github/workflows/build.yml

@@ -44,7 +44,7 @@ jobs:
         run: |
           make check || (cat test/test-suite.log; false)
       - name: Upload Test Results
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: libuev-test-${{ matrix.compiler }}
           path: test/*
@@ -53,7 +53,7 @@ jobs:
     runs-on: ubuntu-latest
     container: debian:stable
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Installing dependencies
         run: |
           apt-get update

.github/workflows/coverity.yml

@@ -25,7 +25,7 @@ jobs:
                --post-data "token=$TOKEN&project=${COVERITY_PROJ}&md5=1" \
                -O coverity-latest.tar.gz.md5
           echo "md5=$(cat coverity-latest.tar.gz.md5)" | tee -a $GITHUB_OUTPUT
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         id: cache
         with:
           path: coverity-latest.tar.gz