Update cargo-nextest used on CI (#10211)

This commit updates the version of `cargo nextest` used on CI from
0.9.67 to 0.9.88. It turns out that the nightly used in testing,
`nightly-2025-01-09`, cannot actually compile 0.9.67 due to a bug in the
`ahash` crate dependency. This never showed up prior on CI because we
cache the build of `cargo nextest` so the update of rustc to a new
nightly did not force a rebuild to happen. Now that the cache has been
removed the error is now showing up, so this will hopefully unblock the
queue.

.github/workflows/main.yml

@@ -1070,7 +1070,7 @@ jobs:
     name: Miri
     runs-on: ubuntu-latest
     env:
-      CARGO_NEXTEST_VERSION: 0.9.67
+      CARGO_NEXTEST_VERSION: 0.9.88
       MIRIFLAGS: -Zmiri-permissive-provenance
     steps:
     - uses: actions/checkout@v4