This fixes an issue with the gRPC client builder where the content negotiation header
was only set if the RPC version was specified. This meant that if the version was unset
but the genesis commitment was set, that no header was written and the genesis
commitment was ignored.

…ethods (#1298)

Write RPC requests are now required to contain the network's genesis commitment
as part of their ACCEPT header.

The MSRV check now only runs on push to main/next (in publish-dry-run.yml)
and when publishing a release (in publish-main.yml), rather than on every PR.

This makes PR CI faster and less resource-intensive. Any MSRV issues will
still be caught before publication, and can be fixed locally using
scripts/check-msrv.sh.

Changes:
- Delete .github/workflows/msrv.yml
- Add cleanup-runner action for freeing disk space
- Add MSRV check steps to publish-dry-run.yml
- Add MSRV check steps to publish-main.yml

See also:
- 0xMiden/miden-base#2233
- 0xMiden/miden-vm#2468
- 0xMiden/miden-vm#2460

…` into `get_account` (#1385)

This removes root spans which run essentially forever, rendering them useless.

#1326)

…ed (#1517)

…UNTIME` (#1525)

)

…down for all locks to be released (#1533)