Bug: Default build flags have warnings in Bazel 7

[brentleyjones]

Description

WARNING: Option 'experimental_remote_download_regex' is deprecated: Use --remote_download_regex instead

Reproduction steps

Build one of the examples when using Bazel 7+.

Expected behavior

We should adjust the flags we set based on the Bazel version we detect in the outer invocation.

rules_xcodeproj version

1.15.0

Xcode version

N/A

Bazel version

7.0.1

rules_apple version

No response

rules_swift version

No response

Additional information

No response

[jschear]

Fixed in #3125.