Bump exceptions submodule so that dist-boot is .gitignore'd

`exceptions` is a stage-0 boot library as of commit 30272412, which means that building `exceptions` in a GHC tree will generate a `dist-boot` directory. However, this directory was not specified in `exceptions`' `.gitignore` file, which causes it to dirty up the current `git` working directory. Accordingly, this bumps the `exceptions` submodule to commit ghc/packages/exceptions@23c0b8a5, which adds `dist-boot` to the `.gitignore` file.

Bump exceptions submodule so that dist-boot is .gitignore'd
`exceptions` is a stage-0 boot library as of commit 30272412, which means that building `exceptions` in a GHC tree will generate a `dist-boot` directory. However, this directory was not specified in `exceptions`' `.gitignore` file, which causes it to dirty up the current `git` working directory. Accordingly, this bumps the `exceptions` submodule to commit ghc/packages/exceptions@23c0b8a5, which adds `dist-boot` to the `.gitignore` file.
aa318338 · Ryan Scott · Marge Bot · 9d97f4b5 · 23c0b8a5
Commit aa318338 authored May 05, 2020 by Ryan Scott Committed by Marge Bot May 08, 2020
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--- a/exceptions @ 23c0b8a5
+++ b/exceptions @ 23c0b8a5
-Subproject commit fe4166f8d23d8288ef2cbbf9e36118b6b99e0d7d
+Subproject commit 23c0b8a50d7592af37ca09beeec16b93080df98f