there was actually an update available, squid: 6.10 -> 6.12, which solved the issue for me
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curl -k https://10.100.1.1
Mar 30 22:23:35 router lighttpd[26522]: (mod_openssl.c.3042) SSL: 5 error:0201502D:system library:ioctl:Operation not supported
Mar 30 22:23:35 router lighttpd[26522]: (mod_openssl.c.3042) SSL: 5 error:0201502D:system library:ioctl:Operation not supported
Mar 30 22:23:35 router lighttpd[26522]: (mod_openssl.c.3042) SSL: 5 error:1427D044:SSL routines:construct_stateless_ticket:internal error
Mar 30 22:23:35 router lighttpd[26522]: (mod_openssl.c.3042) SSL: 5 error:0201502D:system library:ioctl:Operation not supported
Mar 30 22:23:35 router lighttpd[26522]: (mod_openssl.c.3059) SSL: -1 5 45 Operation not supported
configctl webgui restart renew
Enter an option: 12
Fetching change log information, please wait... done
This will automatically fetch all available updates and apply them.
Proceed with this action? [y/N]: h
>>> Check installed kernel version
Version 21.1.4 is correct.
>>> Check for missing or altered kernel files
No problems detected.
>>> Check installed base version
Version 21.1.4 is correct.
>>> Check for missing or altered base files
No problems detected.
>>> Check for missing package dependencies
Checking all packages: .......... done
>>> Check for missing or altered package files
Checking all packages: .......... done
>>> Check for core packages consistency
Core package "opnsense" has 67 dependencies to check.
Checking packages: ..................................................................... done