remove stack-lts-9.9.yaml

Not used any more and no longer works after dependency version bumps.

stack-lts-9.9.yaml

@@ -1,23 +0,0 @@
-flags:
-  git-annex:
-    production: true
-    assistant: true
-    pairing: true
-    s3: true
-    webdav: true
-    torrentparser: true
-    webapp: true
-    magicmime: false
-    dbus: false
-    debuglocks: false
-    benchmark: false
-    networkbsd: false
-packages:
-- '.'
-extra-deps:
-- aws-0.17.1
-- bloomfilter-2.0.1.0
-- torrent-10000.1.1
-explicit-setup-deps:
-  git-annex: true
-resolver: lts-9.9