Bump to version 0.8.0 (#1938)

## Which issue does this PR close?

- Part of #1850

## What changes are included in this PR?

## Are these changes tested?

---

**Parts of this PR were drafted with assistance from Codex (with
`gpt-5.2`) and fully reviewed and edited by me. I take full
responsibility for all changes.**

Author: Xuanwo

CHANGELOG.md

@@ -31,7 +31,7 @@ resolver = "2"
 [workspace.package]
 edition = "2024"
 homepage = "https://rust.iceberg.apache.org/"
-version = "0.7.0"
+version = "0.8.0"
 
 license = "Apache-2.0"
 repository = "https://github.com/apache/iceberg-rust"
@@ -78,13 +78,13 @@ futures = "0.3"
 hive_metastore = "0.2.0"
 home = "=0.5.11"
 http = "1.2"
-iceberg = { version = "0.7.0", path = "./crates/iceberg" }
-iceberg-catalog-glue = { version = "0.7.0", path = "./crates/catalog/glue" }
-iceberg-catalog-hms = { version = "0.7.0", path = "./crates/catalog/hms" }
-iceberg-catalog-rest = { version = "0.7.0", path = "./crates/catalog/rest" }
-iceberg-catalog-s3tables = { version = "0.7.0", path = "./crates/catalog/s3tables" }
-iceberg-catalog-sql = { version = "0.7.0", path = "./crates/catalog/sql" }
-iceberg-datafusion = { version = "0.7.0", path = "./crates/integrations/datafusion" }
+iceberg = { version = "0.8.0", path = "./crates/iceberg" }
+iceberg-catalog-glue = { version = "0.8.0", path = "./crates/catalog/glue" }
+iceberg-catalog-hms = { version = "0.8.0", path = "./crates/catalog/hms" }
+iceberg-catalog-rest = { version = "0.8.0", path = "./crates/catalog/rest" }
+iceberg-catalog-s3tables = { version = "0.8.0", path = "./crates/catalog/s3tables" }
+iceberg-catalog-sql = { version = "0.8.0", path = "./crates/catalog/sql" }
+iceberg-datafusion = { version = "0.8.0", path = "./crates/integrations/datafusion" }
 indicatif = "0.18"
 itertools = "0.13"
 libtest-mimic = "0.8.1"