[ghc-9.10-rc] foldl' ambiguities in several packages

[Shayne Fletcher]

using the ghc-9.10 release candidate, at least all of text-short,
unordered-containers and vector-stream fail to compile with ambiguities
around the export of symbol `foldl'`. example:
```
unordered-containers> [1 of 8] Compiling Data.HashMap.Internal.Array
unordered-containers>
/private/var/folders/rj/q93vlym52875_k7nwz_c3wth0000gn/T/stack-da6d6d11ecd50280/unordered-containers-0.2.19.1/Data/HashMap/Internal/Array.hs:66:7-12:
error: [GHC-87543]

unordered-containers>     Ambiguous occurrence ‘foldl'’.
unordered-containers>     It could refer to
unordered-containers>        either ‘Prelude.foldl'’,
unordered-containers>               imported from ‘Prelude’ at
Data/HashMap/Internal/Array.hs:(97,1)-(98,48)
unordered-containers>               (and originally defined in
‘ghc-internal-9.1001.0:GHC.Internal.Data.Foldable’),
unordered-containers>            or ‘Data.HashMap.Internal.Array.foldl'’,
unordered-containers>               defined at
Data/HashMap/Internal/Array.hs:380:1.
unordered-containers>    |
unordered-containers> 66 |     , foldl'
unordered-containers>    |       ^^^^^^
```
so far i've found all such errors can be overcome by qualification at the
export site but is this expected?

-- 
Shayne Fletcher
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