bird2, bird3: update to 2.19.3 and 3.3.3 - #1207

Checking PR #1207: bird2, bird3: update to 2.19.3 and 3.3.3 (Formalities Audit)

✅ Pull request originates from a dedicated feature branch (bird-update-24.10)

Commit eab7c58 - bird2: update to 2.19.3:

✅ Author and committer identities are valid
✅ Commit is not a merge commit
✅ Commit subject layout and length are valid: "bird2: update to 2.19.3"
✅ Commit description lines adhere to width formatting rules
✅ Commit contains a valid 'Signed-off-by:' line matching author or committer
✅ Excellent! Commit contains a valid cryptographic signature (GPG/SSH). Thank you for signing your work! (GPG Key ID: 942FF3271E2AC7DB)
✅ Subject prefix bird2 names a path this commit changes
⚠️ Warning: No reference link (e.g., upstream release notes, changelog, or history URL) detected in description.
⚠️ Commit to stable branch bypasses cherry-pick requirement via override command

Commit 7996dd7 - bird3: update to 3.3.3:

✅ Author and committer identities are valid
✅ Commit is not a merge commit
✅ Commit subject layout and length are valid: "bird3: update to 3.3.3"
✅ Commit description lines adhere to width formatting rules
✅ Commit contains a valid 'Signed-off-by:' line matching author or committer
✅ Excellent! Commit contains a valid cryptographic signature (GPG/SSH). Thank you for signing your work! (GPG Key ID: 942FF3271E2AC7DB)
✅ Subject prefix bird3 names a path this commit changes
⚠️ Warning: No reference link (e.g., upstream release notes, changelog, or history URL) detected in description.
⚠️ Commit to stable branch bypasses cherry-pick requirement via override command