fix: missing bumpversion entry for lance-tokenizer (#6526)

This fixes the release bump configuration after `lance-tokenizer` was
added to the workspace dependencies. `.bumpversion.toml` was missing the
corresponding replacement rule, so version bumps could leave that
internal dependency on the previous version. This is a targeted
config-only fix to keep the release automation updating all workspace
crates consistently.

Author: Xuanwo

.bumpversion.toml

@@ -115,6 +115,11 @@ filename = "Cargo.toml"
 search = 'lance-testing = {{ version = "={current_version}"'
 replace = 'lance-testing = {{ version = "={new_version}"'
 
+[[tool.bumpversion.files]]
+filename = "Cargo.toml"
+search = 'lance-tokenizer = {{ version = "={current_version}"'
+replace = 'lance-tokenizer = {{ version = "={new_version}"'
+
 [[tool.bumpversion.files]]
 filename = "Cargo.toml"
 search = 'fsst = {{ version = "={current_version}"'
@@ -145,4 +150,3 @@ replace = 'version = "{new_version}"'
 filename = "java/pom.xml"
 search = "<version>{current_version}</version>"
 replace = "<version>{new_version}</version>"
-