fix(deps): bump openssl 0.10.78 -> 0.10.80 (closes 3 Dependabot alerts) (#46)

Three open Dependabot alerts on the panll default branch (1 high, 2
moderate) all pointed at the transitive `openssl` crate pulled in via
`reqwest = "0.12"`:

  #12 (HIGH)   GHSA-… — X509Ref::ocsp_responders UB on non-UTF-8
                       OCSP URLs           (patched in 0.10.79)
  #13 (medium) rust-openssl heap buffer overflow when encrypting
               with AES key-wrap-with-padding (patched in 0.10.79)
  #14 (medium) rust-openssl potential OOB write in
               CipherCtxRef::cipher_update_inplace for AES-KW-PAD
               ciphers                       (patched in 0.10.80)

Bumping to 0.10.80 (the highest patched-version requirement) closes
all three at once. Lockfile-only change — no Cargo.toml touched, no
behaviour change in panll. openssl-sys is dragged from 0.9.114 to
0.9.116 as required by the openssl bump.

GitHub flagged these on push of the standards#93 .gitignore PR (#45);
unrelated to that PR's scope, addressed separately here.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath