bump Rust Driver to 1.6.0 + later panic fix (#462)

CI tests are failing due to a panic in the Rust Driver, which was fixed
in scylla-rust-driver/pull/1644, after 1.6.0 was released. This PR
updates the driver to commit
e04a12a9950cb3d051288541d5439835098c5cc2 (the newest commit on Rust
Driver's main branch), which should fix the CI tests.

`Cargo.lock`'s changes were performed by running:
```
cargo update -p scylla-cql -p scylla-proxy -p scylla --manifest-path=scylla-rust-wrapper/Cargo.toml
```

Author: wprzytula

scylla-rust-wrapper/Cargo.lock

@@ -11,7 +11,7 @@ license = "MIT OR Apache-2.0"
 rust-version = "1.88"
 
 [dependencies]
-scylla = { git = "https://github.com/scylladb/scylla-rust-driver.git", rev = "v1.5.0", features = [
+scylla = { git = "https://github.com/scylladb/scylla-rust-driver.git", rev = "e04a12a9950cb3d051288541d5439835098c5cc2", features = [
     "openssl-010",
     "metrics",
     "unstable-cpp-rs",
@@ -38,8 +38,8 @@ bindgen = "0.65"
 chrono = "0.4.20"
 
 [dev-dependencies]
-scylla-proxy = { git = "https://github.com/scylladb/scylla-rust-driver.git", rev = "v1.5.0" }
-scylla-cql = { git = "https://github.com/scylladb/scylla-rust-driver.git", rev = "v1.5.0" }
+scylla-proxy = { git = "https://github.com/scylladb/scylla-rust-driver.git", rev = "e04a12a9950cb3d051288541d5439835098c5cc2" }
+scylla-cql = { git = "https://github.com/scylladb/scylla-rust-driver.git", rev = "e04a12a9950cb3d051288541d5439835098c5cc2" }
 bytes = "1.10.0"
 itertools = "0.10.3"
 assert_matches = "1.5.0"