Tests: eliminate ref to s3.amazonaws.com/hackage.fpcomplete.com/

Author: mpilgrem

tests/integration/tests/1265-extensible-snapshots/files/snapshots/remote-snapshot.yaml

@@ -1,4 +1,4 @@
 name: remote-snapshot
 snapshot: ghc-9.10.3
 packages:
-- archive: https://s3.amazonaws.com/hackage.fpcomplete.com/package/acme-missiles-0.3.tar.gz
+- archive: https://hackage.haskell.org/package/acme-missiles-0.3/acme-missiles-0.3.tar.gz