Log Message:
textproc/libxlsxwriter: Update to 1.1.7

In addition to the below, a pkglint warning that we should += to
BUILDLINK_ABI_DEPENDS instead of ?= was addressed.

Changes:

1.1.7
- Bump `.so` version to 6. This was missed in the previous release.

1.1.6
- Updated vendored version of minizip to v 1.3.0 to include upstream fixes.
  Feature request [#419].
- Added `quote_prefix` format property.
  Feature request [#385].
- Added support for signed VBA projects.
- Fix worksheet password hashing algorithm for long passwords. Replace/fix
  the worksheet protection password algorithm so that is works correctly
  for strings over 24 chars.
- Fix cmake minizip version check.
  Feature request [#405].
- Fix for buffer overflow with utf-8 strings in data validation.
  Feature request [#394].
- Fix for range in text type conditional format.
  Feature request [#395].
- Fix 32bit multiply with overflow issue for images.
  Fix multiply with overflow issue when image locations in the worksheet
  were greater than the u32 max value.
- Added Swift package manager support.
- Added support for building Zig library.