[25.12] mesh11sd: update to version 7.3.0 - #1202

Checking PR #1202: mesh11sd: update to version 7.3.0 (Formalities Audit)

✅ Pull request originates from a dedicated feature branch (mesh11sd-7.3.0-25.12)

Commit 4e04ef0 - mesh11sd: update to version 7.3.0:

✅ Author and committer identities are valid
✅ Commit is not a merge commit
✅ Commit subject layout and length are valid: "mesh11sd: update to version 7.3.0"
✅ Commit description lines adhere to width formatting rules
✅ Commit contains a valid 'Signed-off-by:' line matching author or committer
⚠️ Warning: Commit is unsigned or cryptographic signature verification failed (Reason: unsigned). Signing commits is a recommended best practice for verifying identity, but is not mandatory.
✅ Commit explicitly specifies cherry-pick origin context
⚠️ Could not fetch upstream commit 6fef7b9 from GitHub API (HTTP 422)