[Minor] Update object_store to 0.12.5 (#20378)

## Which issue does this PR close?


## Rationale for this change

Keep up to date. I saw when looking at
#20325 we were still at
0.12.4 (and are reading metadata per range). This can bring a (probably
minor, as metadata reading should be pretty cheap) improvement (I
couldn't see an improvement locally).

## What changes are included in this PR?

Update to 0.12.5. 
Note it still does a metadata request, but only a single one per
`get_ranges`.

## Are these changes tested?

## Are there any user-facing changes?

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Author: Dandandan

Cargo.lock

@@ -165,7 +165,7 @@ liblzma = { version = "0.4.6", features = ["static"] }
 log = "^0.4"
 memchr = "2.8.0"
 num-traits = { version = "0.2" }
-object_store = { version = "0.12.4", default-features = false }
+object_store = { version = "0.12.5", default-features = false }
 parking_lot = "0.12"
 parquet = { version = "57.3.0", default-features = false, features = [
     "arrow",