Revert "Upgrade to latest rules_boost"

[rjhuijsman]

Reverts #70

Alas, that change causes a failure when pulled reboot-dev/respect:

$ bazel build //object_store:library
INFO: Invocation ID: 1c4294c4-b31d-468f-b128-9dcdea56faaf
ERROR: /home/vscode/.cache/bazel/_bazel_vscode/e9b5149ef40c40531841044f5a70254d/external/com_github_reboot_dev_zlib/BUILD.bazel:2:6: no such target '@net_zlib_zlib//:zlib': target 'zlib' not declared in package '' defined by /home/vscode/.cache/bazel/_bazel_vscode/e9b5149ef40c40531841044f5a70254d/external/net_zlib_zlib/BUILD.bazel and referenced by '@com_github_reboot_dev_zlib//:z'
INFO: Repository boost instantiated at:
  /workspaces/respect/WORKSPACE.bazel:62:5: in <toplevel>
  /workspaces/respect/bazel/deps.bzl:46:19: in deps
  /home/vscode/.cache/bazel/_bazel_vscode/e9b5149ef40c40531841044f5a70254d/external/com_github_3rdparty_eventuals/bazel/deps.bzl:103:15: in deps
  /home/vscode/.cache/bazel/_bazel_vscode/e9b5149ef40c40531841044f5a70254d/external/com_github_3rdparty_stout/bazel/deps.bzl:14:15: in deps
  /home/vscode/.cache/bazel/_bazel_vscode/e9b5149ef40c40531841044f5a70254d/external/com_github_nelhage_rules_boost/boost/boost.bzl:156:10: in boost_deps
  /home/vscode/.cache/bazel/_bazel_vscode/e9b5149ef40c40531841044f5a70254d/external/bazel_tools/tools/build_defs/repo/utils.bzl:233:18: in maybe
Repository rule http_archive defined at:
  /home/vscode/.cache/bazel/_bazel_vscode/e9b5149ef40c40531841044f5a70254d/external/bazel_tools/tools/build_defs/repo/http.bzl:355:31: in <toplevel>
ERROR: Analysis of target '//object_store:library' failed; build aborted: 
INFO: Elapsed time: 2.087s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (0 packages loaded, 0 targets configured)
    Fetching https://github.com/boostorg/boost/releases/download/boost-1.84.0/boost-1.84.0.tar.gz

It looks like we'll need to debug the new zlib issue (some conflict?), but in the meantime let's get back to a working state.

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Branch up-to-date, waiting for checks.