ci: only use -Z direct-minimal-versions for MSRV check (#1656)

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Context:
#1195 (comment)
[the
docs](https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#minimal-versions)
mentions that the feature is not recommended anymore

I've ran an issue with this flag when upgrading datafusion from 47 ->
48. -Z minimal-versions will pull in very old versions of transitive
dependencies

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Author: kevinjqliu

.github/workflows/ci.yml

@@ -144,7 +144,7 @@ jobs:
         uses: ./.github/actions/setup-builder
       - name: Generate minimal versions lockfile
         run: |
-          cargo generate-lockfile -Z direct-minimal-versions -Z minimal-versions
+          cargo generate-lockfile -Z direct-minimal-versions
       - name: Setup MSRV Rust toolchain
         uses: ./.github/actions/setup-builder
         with: