ttyd: update to 1.7.7

ttyd: update to 1.7.7

Breaking Changes

    The web terminal is readonly by default now, to make it writable,
    use -W option.

Changelog 1.7.7

    Bump to 1.7.7
    cmake: add static version back

Changelog 1.7.6

    workflow: update actions packages
    cmake: get version from git ref

Changelog 1.7.5

    html: allow overriding client options with URL query
    server: add --exit-no-conn option
    html: add safari mobile full screen support
    html: Add Unicode 11 xterm.js addon
    html: upgrade to xterm 5.4.0
    add trzszDragInitTimeout option

Changelog 1.7.4

    Leverage Docker Layer System
    html: update dependencies
    build(deps): update zlib version 1.2.13 to 1.3 in cross-build.sh
    server: print working directory on start
    server: replace --readonly with --writable
    server: fix -U option not work
    server: do not expose port to public by default
    Add -y flag for easier installation
    improve support for trzsz
    info.max_http_header_data = 65535;
    Add Docker pulls badge
    fix flow control
    Fix typo, OPTOINS -> OPTIONS
    Bump CMake version to 2.8.12

Signed-off-by: Paul Donald <redacted>