pantsbuild/pants release_2.31.0.dev6

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Prepare 2.31.0.dev6 (#22984)

docs: codify the expected number of concurrent stable branches (#22957)

always use pex thru the cli, never as a python module (#22979)

make shell_command targets be runnable via the run goal (#22981)

Upgrade RunsOn AMI to ami-0057bf9b58247b3f0 (#22980)

make the sandboxer startup less chatty (#22625)

upgrade default version of protoc to v30.2 (#22415)

Updated a batch of Rust dependencies (no code changes) (#22973)

Updated GHA deps (#22970)

Persist pip log in the sandbox on plugin resolve (#22965)