examples/ break with bazel 6.0.0

[jmelahman]

$ cd examples
$ bazel build //...
Starting local Bazel server and connecting to it...
Analyzing: 8 targets (40 packages loaded, 46 targets configured)
ERROR: /home/jamison/.cache/bazel/_bazel_jamison/aa4d8cfd50269e290d9b8d3fb2845591/external/bazel_tools/platforms/BUILD:84:6: in alias rule @bazel_tools//platforms:linux: Constraints from @bazel_tools//platforms have been removed. Please use constraints from @platforms repository embedded in Bazel, or preferably declare dependency on https://github.com/bazelbuild/platforms. See https://github.com/bazelbuild/bazel/issues/8622 for details.
ERROR: /home/jamison/.cache/bazel/_bazel_jamison/aa4d8cfd50269e290d9b8d3fb2845591/external/bazel_tools/platforms/BUILD:84:6: Analysis of target '@bazel_tools//platforms:linux' failed
ERROR: /home/jamison/code/forks/rules_pip/examples/tests/BUILD:8:15: While resolving toolchains for target //tests:test_import: invalid registered toolchain '@io_bazel_rules_docker//toolchains/docker:default_linux_toolchain': 
ERROR: Analysis of target '//tests:test_import' failed; build aborted: 
INFO: Elapsed time: 4.200s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (46 packages loaded, 265 targets configured)

which succeeds with examples/.bazelversion,

5.4.0