Fix go-systemd version in certinject

Fixes the unit tests on Fedora.

.cirrus.yml

@@ -31,6 +31,7 @@ task:
         - git clone https://github.com/namecoin/certinject.git
         - cd certinject
         - go mod init github.com/namecoin/certinject
+        - go mod edit -replace github.com/coreos/go-systemd=github.com/coreos/go-systemd/v22@latest
         - go mod tidy
         - go generate ./...
         - go mod tidy
@@ -125,6 +126,7 @@ task:
         - git clone https://github.com/namecoin/certinject.git
         - cd certinject
         - go mod init github.com/namecoin/certinject
+        - go mod edit -replace github.com/coreos/go-systemd=github.com/coreos/go-systemd/v22@latest
         - go mod tidy
         - go generate ./...
         - go mod tidy
@@ -195,6 +197,7 @@ task:
         - git clone https://github.com/namecoin/certinject.git
         - cd certinject
         - go mod init github.com/namecoin/certinject
+        - go mod edit -replace github.com/coreos/go-systemd=github.com/coreos/go-systemd/v22@latest
         - go mod tidy
         - go generate ./...
         - go mod tidy