pcap savefile: Set the date stamp

[skip ci]

Author: fxlb

pcap-savefile.manfile.in

@@ -17,7 +17,7 @@
 .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 .\"
-.TH PCAP-SAVEFILE @MAN_FILE_FORMATS@ "23 May 2023"
+.TH PCAP-SAVEFILE @MAN_FILE_FORMATS@ "2 Aug 2023"
 .SH NAME
 pcap-savefile \- libpcap savefile format
 .SH DESCRIPTION