chore(bazel): enable compatibility option for string join
# Remote Build Execution requires a strong hash function, such as SHA256.
startup --host_jvm_args=-Dbazel.DigestFunction=SHA256
-# Compatibility options; remove in 0.26
-build --incompatible_require_ctx_in_configure_features
+# Compatibility options
+build --incompatible_require_ctx_in_configure_features # remove in 0.26
+build --incompatible_string_join_requires_strings # remove in 0.27
build --workspace_status_command tools/buildstamp/get_workspace_status
build --auto_cpu_environment_group=//buildenv:cpu
