Upgrade to Bazel 7

[ralimi]

Builds under Bazel 7 failed when executed under Github's action runners.

The underlying errors were:

ERROR: /home/runner/.cache/bazel/_bazel_runner/b5ea0b3c9d34e2d5dd9018c7508d45aa/external/_main~chromium_dependencies~chromedriver/BUILD.bazel:2:8: declared output 'external/_main~chromium_dependencies~chromedriver/chromedriver.bin' is a dangling symbolic link
ERROR: /home/runner/.cache/bazel/_bazel_runner/b5ea0b3c9d34e2d5dd9018c7508d45aa/external/_main~chromium_dependencies~chromedriver/BUILD.bazel:2:8: Executing genrule @@_main~chromium_dependencies~chromedriver//:chromedriver failed: not all outputs were created or valid

This issue tracks upgrading to Bazel 7 and not pinning to a specific version.

[ralimi]

Ignoring this issue, since renovate will send pull requests to upgrade it.