fuelup not using latest toolchain

The latest forc version appears to be `0.70.1` (at this time); i cannot seem to upgrade fuelup and use latest toolchain to default to this version.

CLI output attached.

```sh
> fuelup upgrade

Already up to date (fuelup v0.27.4)
Default toolchain set to 'latest-aarch64-apple-darwin'
updating the 'latest-aarch64-apple-darwin' toolchain
Downloading: forc forc-wallet fuel-core fuel-core-keygen
updating the 'nightly-aarch64-apple-darwin' toolchain
Downloading: forc-wallet
updating the 'testnet-aarch64-apple-darwin' toolchain
Downloading: forc forc-wallet fuel-core fuel-core-keygen

latest updated
updated components:
- forc 0.70.1
- forc-wallet 0.15.2
- fuel-core 0.46.0
- fuel-core-keygen 0.46.0

nightly updated
updated components:
- forc-wallet 0.15.2+nightly.20251103.279124d992

testnet updated
updated components:
- forc 0.70.1
- forc-wallet 0.15.2
- fuel-core 0.46.0
- fuel-core-keygen 0.46.0
```

```sh
> fuelup default latest

Default toolchain set to 'latest-aarch64-apple-darwin'
```

```sh
> fuelup show

Default host: aarch64-apple-darwin

Installed toolchains
--------------------
latest-aarch64-apple-darwin (default)
nightly-aarch64-apple-darwin
testnet-aarch64-apple-darwin

active toolchain
----------------
latest-aarch64-apple-darwin (default)
forc : 0.69.1
- forc-client
- forc-call : 0.69.1
- forc-deploy : 0.69.1
- forc-run : 0.69.1
- forc-submit : 0.69.1
- forc-crypto : 0.69.1
- forc-debug : 0.69.1
- forc-doc : 0.69.1
- forc-fmt : 0.69.1
- forc-lsp : 0.69.1
- forc-migrate : 0.69.1
- forc-node : 0.69.1
- forc-publish : 0.69.1
- forc-tx : 0.69.1
- forc-wallet : 0.15.2
fuel-core : 0.46.0
fuel-core-keygen : 0.46.0

fuels versions
--------------
forc : 0.74
forc-wallet : 0.75
```

I would however expect the following output:
```sh
> fuelup show ok 13:21:43
Default host: aarch64-apple-darwin

Installed toolchains
--------------------
latest-aarch64-apple-darwin (default)

active toolchain
----------------
latest-aarch64-apple-darwin (default)
forc : 0.70.1
- forc-client
- forc-call : 0.70.1
- forc-deploy : 0.70.1
- forc-run : 0.70.1
- forc-submit : 0.70.1
- forc-crypto : 0.70.1
- forc-debug : 0.70.1
- forc-doc : 0.70.1
- forc-fmt : 0.70.1
- forc-lsp : 0.70.1
- forc-migrate : 0.70.1
- forc-node : 0.70.1
- forc-publish : 0.70.1
- forc-tx : 0.70.1
- forc-wallet : 0.15.2
fuel-core : 0.46.0
fuel-core-keygen : 0.46.0

fuels versions
--------------
forc : 0.75
forc-wallet : 0.75
```