Bump stellar-xdr and soroban-env crates (#1841)

### What

Update the `stellar-xdr` crate to `26.0.1` and the `soroban-env-*`
crates to `26.1.3`.

### Why

The crates contain dependency updates to `ethnum` that patch compiler
errors introduced in a recent nightly version. See
stellar/rs-stellar-xdr#525 for details.

### Known limitations

None

Author: mootz12

Cargo.lock

@@ -30,25 +30,25 @@ soroban-token-spec = { version = "26.0.0-rc.1", path = "soroban-token-spec" }
 stellar-asset-spec = { version = "26.0.0-rc.1", path = "stellar-asset-spec" }
 
 [workspace.dependencies.soroban-env-common]
-version = "=26.1.2"
+version = "=26.1.3"
 # git = "https://github.com/stellar/rs-soroban-env"
 # rev = "c0e58f94ff2983a09440cef6a54253349fd3c4db"
 
 [workspace.dependencies.soroban-env-guest]
-version = "=26.1.2"
+version = "=26.1.3"
 # git = "https://github.com/stellar/rs-soroban-env"
 # rev = "c0e58f94ff2983a09440cef6a54253349fd3c4db"
 
 [workspace.dependencies.soroban-env-host]
-version = "=26.1.2"
+version = "=26.1.3"
 # git = "https://github.com/stellar/rs-soroban-env"
 # rev = "c0e58f94ff2983a09440cef6a54253349fd3c4db"
 
 [workspace.dependencies.stellar-strkey]
 version = "=0.0.16"
 
 [workspace.dependencies.stellar-xdr]
-version = "=26.0.0"
+version = "=26.0.1"
 # git = "https://github.com/stellar/rs-stellar-xdr"
 # rev = "dd7a165a193126fd37a751d867bee1cb8f3b55a6"
 default-features = false