Add PEP 723 dependencies to tfdoc.py, versions.py and build_service_agents.py (#3203)

tools/versions.py

@@ -13,6 +13,13 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+#
+# /// script
+# requires-python = ">=3.11"
+# dependencies = [
+#    "click",
+# ]
+# ///
 
 import re
 from pathlib import Path