Update to testing Linux with LibreSSL 4 (#83)

Author: SeanTAllen

.github/workflows/breakage-against-ponyc-latest.yml

@@ -9,7 +9,7 @@ jobs:
     name: Test against ponyc main
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/ponylang/shared-docker-ci-x86-64-unknown-linux-builder-with-libressl-3.9.2:latest
+      image: ghcr.io/ponylang/shared-docker-ci-x86-64-unknown-linux-builder-with-libressl-4.0.0:latest
     steps:
       - uses: actions/[email protected]
       - name: Test

.github/workflows/pr.yml

@@ -36,7 +36,7 @@ jobs:
     name: Test against recent ponyc release
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/ponylang/shared-docker-ci-x86-64-unknown-linux-builder-with-libressl-3.9.2:release
+      image: ghcr.io/ponylang/shared-docker-ci-x86-64-unknown-linux-builder-with-libressl-4.0.0:release
     steps:
       - uses: actions/[email protected]
       - name: Test