Unpin log (#335)

Preparation for updating the SDK version. Closes #333

Changes:
- Update zombienet-sdk.
- Update log to 0.4.21 to verify.

<details><summary>cargo update output</summary>
<p>

```pre
Updating crates.io index
    Removing aes-kw v0.2.1
    Removing alloc-no-stdlib v2.0.4
    Removing alloc-stdlib v0.2.2
    Removing ast_node v0.9.5
    Removing async-compression v0.4.10
    Removing base64-simd v0.7.0
    Removing base64-simd v0.8.0
    Removing better_scoped_tls v0.1.1
    Removing block-padding v0.3.3
    Removing brotli v6.0.0
    Removing brotli-decompressor v4.0.0
    Removing cbc v0.1.2
    Removing cmake v0.1.50
    Removing dashmap v5.5.3
    Removing data-url v0.3.0
    Removing debugid v0.8.0
    Removing deno_ast v0.31.6
    Removing deno_console v0.123.0
    Removing deno_core v0.229.0
    Removing deno_crypto v0.137.0
    Removing deno_fetch v0.147.0
    Removing deno_media_type v0.1.4
    Removing deno_native_certs v0.2.0
    Removing deno_net v0.115.0
    Removing deno_ops v0.105.0
    Removing deno_tls v0.110.0
    Removing deno_unsync v0.3.3
    Removing deno_url v0.123.0
    Removing deno_web v0.154.0
    Removing deno_webidl v0.123.0
    Removing deno_websocket v0.128.0
    Removing dlopen2 v0.6.1
    Removing dlopen2_derive v0.4.0
    Removing dprint-swc-ext v0.13.0
    Removing fastwebsockets v0.5.0
    Removing from_variant v0.1.6
    Removing fslock v0.1.8
    Removing hstr v0.2.10
    Removing if_chain v1.0.2
    Removing is-macro v0.3.5
    Removing libz-ng-sys v1.1.15
    Removing new_debug_unreachable v1.0.6
    Removing num-bigint-dig v0.8.4
    Removing num-iter v0.1.44
    Removing outref v0.1.0
    Removing outref v0.5.1
    Removing p256 v0.13.2
    Removing p384 v0.13.0
    Removing pathdiff v0.2.1
    Removing pem-rfc7468 v0.7.0
    Removing phf v0.11.2
    Removing phf_generator v0.11.2
    Removing phf_macros v0.11.2
    Removing phf_shared v0.11.2
    Removing pjs-rs v0.1.2
    Removing pkcs1 v0.7.5
    Removing pmutil v0.6.1
    Removing primeorder v0.13.6
    Removing proc-macro-rules v0.4.0
    Removing proc-macro-rules-macros v0.4.0
    Removing rsa v0.9.6
    Removing rustls-tokio-stream v0.2.9
    Removing ryu-js v1.0.1
    Removing scoped-tls v1.0.1
    Removing serde_v8 v0.138.0
    Removing sha-1 v0.10.0
    Removing simd-abstraction v0.7.1
    Removing simdutf8 v0.1.4
    Removing smartstring v1.0.1
    Removing sourcemap v6.4.1
    Removing sourcemap v7.1.1
    Removing stacker v0.1.15
    Removing string_enum v0.4.1
    Removing swc_atoms v0.6.4
    Removing swc_common v0.33.9
    Removing swc_config v0.1.7
    Removing swc_config_macro v0.1.2
    Removing swc_ecma_ast v0.110.10
    Removing swc_ecma_codegen v0.146.32
    Removing swc_ecma_codegen_macros v0.7.3
    Removing swc_ecma_loader v0.45.10
    Removing swc_ecma_parser v0.141.26
    Removing swc_ecma_transforms_base v0.134.42
    Removing swc_ecma_transforms_classes v0.123.43
    Removing swc_ecma_transforms_macros v0.5.3
    Removing swc_ecma_transforms_proposal v0.168.52
    Removing swc_ecma_transforms_react v0.180.52
    Removing swc_ecma_transforms_typescript v0.185.52
    Removing swc_ecma_utils v0.124.32
    Removing swc_ecma_visit v0.96.10
    Removing swc_eq_ignore_macros v0.1.2
    Removing swc_macros_common v0.3.8
    Removing swc_visit v0.5.7
    Removing swc_visit_macros v0.5.8
    Removing text_lines v0.6.0
    Removing tokio-socks v0.5.1
    Removing triomphe v0.1.11
    Removing typed-arena v2.0.2
    Removing unic-char-property v0.9.0
    Removing unic-char-range v0.9.0
    Removing unic-common v0.9.0
    Removing unic-ucd-ident v0.9.0
    Removing unic-ucd-version v0.9.0
    Removing unicode-id v0.3.4
    Removing unicode-id-start v1.1.2
    Removing urlpattern v0.2.0
    Removing v8 v0.81.0
    Removing vsimd v0.8.0
    Removing wasm-streams v0.4.0
    Removing webpki-roots v0.25.4
    Updating zombienet-configuration v0.2.2 -> v0.2.3
    Updating zombienet-orchestrator v0.2.2 -> v0.2.3
    Updating zombienet-prom-metrics-parser v0.2.2 -> v0.2.3
    Updating zombienet-provider v0.2.2 -> v0.2.3
    Updating zombienet-sdk v0.2.2 -> v0.2.3
    Updating zombienet-support v0.2.2 -> v0.2.3
```

</p>
</details> 

- [x] Does not require a CHANGELOG entry

---------

Signed-off-by: Oliver Tale-Yazdi <[email protected]>