wip: pebble bug

Author: ldez

.github/workflows/pr.yml

@@ -46,10 +46,10 @@ jobs:
           golangci-lint --version
 
       - name: Install Pebble
-        run: go install github.com/letsencrypt/pebble/v2/cmd/pebble@main
+        run: go install github.com/letsencrypt/pebble/v2/cmd/pebble@3fe019bbc0a41ed16e2fee31592bb91751acaa47
 
       - name: Install challtestsrv
-        run: go install github.com/letsencrypt/pebble/v2/cmd/pebble-challtestsrv@main
+        run: go install github.com/letsencrypt/pebble/v2/cmd/pebble-challtestsrv@3fe019bbc0a41ed16e2fee31592bb91751acaa47
 
       - name: Set up a Memcached server
         uses: niden/actions-memcached@v7