ci(autopkgtest): use autopkgtest 5.17

.github/workflows/autopkgtest.yaml

@@ -76,9 +76,9 @@ jobs:
     - name: Install autopkgtest from source
       run: |
         mkdir --parent /tmp/autopkgtest-build
-        curl --silent --output /tmp/autopkgtest-build/autopkgtest-master.tar --proto https --tlsv1.3 --http2-prior-knowledge https://salsa.debian.org/ci-team/autopkgtest/-/archive/master/autopkgtest-master.tar
-        tar --extract --file=/tmp/autopkgtest-build/autopkgtest-master.tar --directory=/tmp/autopkgtest-build
-        cd /tmp/autopkgtest-build/autopkgtest-master
+        curl --silent --output /tmp/autopkgtest-build/autopkgtest-5.17.tar --proto https --tlsv1.3 --http2-prior-knowledge https://salsa.debian.org/ci-team/autopkgtest/-/archive/debian/5.17/autopkgtest-debian-5.17.tar
+        tar --extract --file=/tmp/autopkgtest-build/autopkgtest-5.17.tar --directory=/tmp/autopkgtest-build
+        cd /tmp/autopkgtest-build/autopkgtest-debian-5.17
         sudo apt -qq build-dep . --default-release=testing
         DEB_BUILD_OPTIONS=nocheck debuild --unsigned-source --unsigned-changes
         sudo apt -qq install ../autopkgtest*.deb