dev: bump to stackage lts-20.1

Shake.hs

@@ -1,5 +1,5 @@
 #!/usr/bin/env stack
-{- stack script --resolver nightly-2022-09-01 --compile
+{- stack script --resolver  lts-20.1 --compile
    --extra-include-dirs /Library/Developer/CommandLineTools/SDKs/MacOSX12.1.sdk/usr/include/ffi
    --package base-prelude
    --package directory

bin/hledger-addon-example.hs

@@ -1,6 +1,6 @@
 #!/usr/bin/env stack
 -- stack runghc --verbosity info --package hledger --package string-qq
---resolver nightly-2022-09-01
+--resolver  lts-20.1
 
 {-
 hledger-addon-example - a hledger addon command template.

stack.yaml

@@ -1,6 +1,6 @@
-# stack build plan using GHC 9.2.4
+# stack build plan using GHC 9.2.5
 
-resolver: nightly-2022-09-01
+resolver:  lts-20.1
 
 packages:
 - hledger-lib
@@ -10,10 +10,8 @@ packages:
 
 extra-deps:
 # for hledger-lib:
-- breakpoint-0.1.0.0
 # for hledger:
 # for hledger-ui:
-- brick-1.0
 - fsnotify-0.4.0.0
 # for hledger-web:
 # for Shake.hs: