chore(deps): Update stackage snapshot to lts-22.20

The freebsd build is kept at 21.7 / GHC 9.4.5, because no newer GHC
versioin is supported here.

stack-21.7.yaml

@@ -0,0 +1,25 @@
+# We're keeping this at 21.7 for freebsd right now, because:
+# Error: [S-9443]
+#        No setup information found for ghc-9.6.4 on your platform. This probably means a GHC binary
+#        distribution has not yet been added for OS key freebsd64-ino64. Supported versions:
+#        ghc-8.4.3, ghc-8.4.4, ghc-8.6.2, ghc-8.6.3, ghc-8.6.4, ghc-8.6.5, ghc-8.8.1, ghc-8.8.2,
+#        ghc-8.8.3, ghc-8.8.4, ghc-8.10.3, ghc-8.10.4, ghc-8.10.6, ghc-8.10.7, ghc-9.0.2, ghc-9.2.5,
+#        ghc-9.2.6, ghc-9.2.7, ghc-9.2.8 and ghc-9.4.5.
+resolver: lts-21.7 # 2023-08-14, GHC 9.4.5
+
+nix:
+  packages:
+    - pcre
+    - pkgconfig
+    - postgresql
+    - zlib
+  # disable pure by default so that the test enviroment can be passed
+  pure: false
+
+extra-deps:
+  - configurator-pg-0.2.7
+  - fuzzyset-0.2.4
+  - hasql-notifications-0.2.1.1
+  - hasql-pool-1.0.1
+  - megaparsec-9.2.2
+  - postgresql-libpq-0.10.0.0