Manually keep age of announce messages so as not to invalidate them on jumps.

[davidv1992]

No description provided.

[codecov]

Codecov Report

Patch coverage: 14.11% and project coverage change: -0.21% ⚠️

Comparison is base (e9897eb) 65.21% compared to head (deae6d2) 65.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #261      +/-   ##
==========================================
- Coverage   65.21%   65.00%   -0.21%     
==========================================
  Files          48       48              
  Lines        5275     5258      -17     
==========================================
- Hits         3440     3418      -22     
- Misses       1835     1840       +5     

Files Changed	Coverage Δ
statime-linux/src/main.rs	0.00% <0.00%> (ø)
statime/src/bmc/foreign_master.rs	0.00% <0.00%> (ø)
statime/src/port/mod.rs	3.42% <0.00%> (+0.01%)	⬆️
statime/src/ptp_instance.rs	0.00% <0.00%> (ø)
statime/src/bmc/bmca.rs	84.92% <38.70%> (-2.01%)	⬇️

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