ci: Temporarily pin arm android test to nightly-2024-08-30

```
  panicked at /home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/../../backtrace/src/symbolize/gimli/libs_dl_iterate_phdr.rs:48:30:

  thread panicked while processing panic. aborting.
  libc: Fatal signal 6 (SIGABRT), code -6 in tid 22188 (alloc_tests::te)
  libc: Unable to open connection to debuggerd: Connection refused
  qemu: uncaught target signal 6 (Aborted) - core dumped
  error: test failed, to rerun pass `--test arc`

  Caused by:
    process didn't exit successfully: `qemu-arm /home/runner/work/portable-atomic/portable-atomic/target/careful/arm-linux-androideabi/debug/deps/arc-6e5994f331e3eb22` (signal: 6, SIGABRT: process abort signal)
  test alloc_tests::test_clone_from_slice_panic - should panic ... ::endgroup::
  error: process didn't exit successfully: `/home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/cargo careful test -Z doctest-xcompile -v --target arm-linux-androideabi --manifest-path portable-atomic-util/Cargo.toml --features std` (exit status: 101)
```

.github/.cspell/project-dictionary.txt

@@ -46,6 +46,7 @@ espup
 exynos
 getauxval
 getpid
+gimli
 Halfword
 HWCAP
 hwprobe
@@ -102,6 +103,7 @@ nostdinc
 opensbi
 osfmk
 osxsave
+phdr
 picolibc
 pointee
 prctl

.github/workflows/ci.yml

@@ -177,7 +177,8 @@ jobs:
             target: armv7-unknown-linux-gnueabihf
           - rust: nightly
             target: armeb-unknown-linux-gnueabi
-          - rust: nightly
+          # TODO: backtrace bug: panicked at /home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/../../backtrace/src/symbolize/gimli/libs_dl_iterate_phdr.rs:48:30:
+          - rust: nightly-2024-08-30
             target: arm-linux-androideabi
           - rust: nightly
             target: i586-unknown-linux-gnu