- Upgraded rules_python to 0.26.0 to include https://github.com/bazelbuild/rules_python/pull/1433
- Updated the lockfile on all supported platforms.
- Enable `--lockfile_mode=update` for regular builds (mostly affecting local build)
- Enable `--lockfile_mode=error` for CI builds to ensure lockfile is up-to-date.

After this change, please make sure to update the lockfile by running `bazel mod deps` whenever you change the MODULE.bazel file or any .bzl file used in it.

Closes #20101.

PiperOrigin-RevId: 580553351
Change-Id: I54c3298e6c23c8392226e1e32ba203689f334226