Bump version to 22.0.8 (#1466)

### What
Bump version to 22.0.8, creating release branch.

### Why
Triggered by @dmkozh in
https://github.com/stellar/rs-soroban-sdk/actions/runs/15077516581.

### What is next

See the release instructions for a full rundown on the release process:
https://github.com/stellar/actions/blob/main/README-rust-release.md

Commit any changes to the `release/v22.0.8` branch that are needed in
this release.

If this is a regular release releasing from `main`, merge this PR when
ready, and after merging, create a release for this version by going to
this link:
https://github.com/stellar/rs-soroban-sdk/releases/new?tag=v22.0.8&title=22.0.8

If this is a backport or patch release of a past version, see the
release instructions. When ready to release this branch create a release
by going to this link:

https://github.com/stellar/rs-soroban-sdk/releases/new?tag=v22.0.8&title=22.0.8&target=release/v22.0.8

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Dmytro Kozhevin <dmytro@stellar.org>

Author: github-actions[bot]

.github/workflows/rust.yml

@@ -183,7 +183,7 @@ jobs:
         sys:
         - os: ubuntu-latest
           target: wasm32v1-none
-          cargo-hack-feature-options: ''
+          cargo-hack-feature-options: --manifest-path Cargo.toml --exclude soroban-spec --exclude soroban-spec-rust --exclude soroban-ledger-snapshot --exclude-features testutils,docs,default,std --feature-powerset
         - os: ubuntu-latest
           target: x86_64-unknown-linux-gnu
           cargo-hack-feature-options: '--feature-powerset --exclude-features docs'

Cargo.lock

@@ -12,16 +12,16 @@ members = [
 ]
 
 [workspace.package]
-version = "22.0.7"
+version = "22.0.8"
 rust-version = "1.84.0"
 
 [workspace.dependencies]
-soroban-sdk = { version = "22.0.7", path = "soroban-sdk" }
-soroban-sdk-macros = { version = "22.0.7", path = "soroban-sdk-macros" }
-soroban-spec = { version = "22.0.7", path = "soroban-spec" }
-soroban-spec-rust = { version = "22.0.7", path = "soroban-spec-rust" }
-soroban-ledger-snapshot = { version = "22.0.7", path = "soroban-ledger-snapshot" }
-soroban-token-sdk = { version = "22.0.7", path = "soroban-token-sdk" }
+soroban-sdk = { version = "22.0.8", path = "soroban-sdk" }
+soroban-sdk-macros = { version = "22.0.8", path = "soroban-sdk-macros" }
+soroban-spec = { version = "22.0.8", path = "soroban-spec" }
+soroban-spec-rust = { version = "22.0.8", path = "soroban-spec-rust" }
+soroban-ledger-snapshot = { version = "22.0.8", path = "soroban-ledger-snapshot" }
+soroban-token-sdk = { version = "22.0.8", path = "soroban-token-sdk" }
 
 [workspace.dependencies.soroban-env-common]
 version = "=22.1.3"