Remove redundant haskell entries

[AlistairB]

These were used temporarily to add missing older versions.

Follows on from #11050.

[github-actions]

Diff for 3fd7b5f:

diff --git a/_bashbrew-cat b/_bashbrew-cat
index cd07cb2..6f62949 100644
--- a/_bashbrew-cat
+++ b/_bashbrew-cat
@@ -1,22 +1,6 @@
 Maintainers: Peter Salvatore <[email protected]> (@psftw), Herbert Valerio Riedel <[email protected]> (@hvr), Alistair Burrowes <[email protected]> (@AlistairB)
 GitRepo: https://github.com/haskell/docker-haskell
 
-Tags: 8.10.5-buster, 8.10.5
-GitCommit: 47d2ca30933d9fa81bff1538c035008bb1c0c197
-Directory: 8.10/buster
-
-Tags: 8.10.5-stretch
-GitCommit: 47d2ca30933d9fa81bff1538c035008bb1c0c197
-Directory: 8.10/stretch
-
-Tags: 8.10.6-buster, 8.10.6
-GitCommit: bc860ec5b664fdd12353a46017e407f10045e9b0
-Directory: 8.10/buster
-
-Tags: 8.10.6-stretch
-GitCommit: bc860ec5b664fdd12353a46017e407f10045e9b0
-Directory: 8.10/stretch
-
 Tags: 8.10.7-buster, 8.10-buster, 8-buster, 8.10.7, 8.10, 8
 GitCommit: 4181ccd382f72959ecb234204fd018b2c203c3fe
 Directory: 8.10/buster
diff --git a/_bashbrew-list b/_bashbrew-list
index b468ee8..1cf2b63 100644
--- a/_bashbrew-list
+++ b/_bashbrew-list
@@ -4,12 +4,6 @@ haskell:8-stretch
 haskell:8.10
 haskell:8.10-buster
 haskell:8.10-stretch
-haskell:8.10.5
-haskell:8.10.5-buster
-haskell:8.10.5-stretch
-haskell:8.10.6
-haskell:8.10.6-buster
-haskell:8.10.6-stretch
 haskell:8.10.7
 haskell:8.10.7-buster
 haskell:8.10.7-stretch
diff --git a/haskell_8.10.5-stretch/Dockerfile b/haskell_8.10.5-stretch/Dockerfile
deleted file mode 100644
index e1f6d2b..0000000
diff --git a/haskell_8.10.5/Dockerfile b/haskell_8.10.5/Dockerfile
deleted file mode 100644
index f8a0198..0000000
diff --git a/haskell_8.10.6-stretch/Dockerfile b/haskell_8.10.6-stretch/Dockerfile
deleted file mode 100644
index 0681814..0000000
diff --git a/haskell_8.10.6/Dockerfile b/haskell_8.10.6/Dockerfile
deleted file mode 100644
index d61263f..0000000