Add dotcl-bin to the implementation check

[snmsts]

Roswell v26.10.117 and later can install dotcl
(a Common Lisp implementation on .NET) as dotcl-bin. With this action,
everything up to the last step already works; only the final check in
test.ros fails because dotcl-bin is not in its table. This PR adds the entry.

Usage:

- uses: 40ants/setup-lisp@v4
  with:
    roswell-version: v26.10.118

and LISP: dotcl-bin in the environment. dotcl needs .NET 10, which is
preinstalled on GitHub's ubuntu-latest runners.

I left the default roswell-version alone. Two things changed in
v26.10.118 that may matter if you decide to bump it later:

• scripts/install-for-ci.sh of a release tag now installs that same release
  (before, a tag's script pointed at the previous one).
• On Linux the script downloads the prebuilt binary for any architecture
  (x86_64, arm64, riscv64, loongarch64) instead of only x86_64, and falls back
  to building from source when there is no binary.

Tested on ubuntu-latest with roswell-version: v26.10.118 in
https://github.com/dotcl/xmls/actions/runs/38234272709 — dotcl-bin,
sbcl-bin, ccl-bin/1.12.2, ecl, cmu-bin/21e, clisp/2.49, clisp-head
and abcl-bin/1.9.2 all pass.

Not working on macOS yet: there the action installs Roswell from Homebrew
regardless of roswell-version, and the current macos-latest image still
resolves the formula to 26.02.116, which does not know dotcl-bin (the
macos-latest / dotcl-bin job in the run above fails for this reason).
It should start working once the runner image picks up a newer formula.

I did not touch the test matrix or the implementation table in the README,
since they look generated.

[svetlyak40wt]

Thank you!

[snmsts]

Thank you for merging!

Do you plan to make a new release? I want to use this from
40ants/setup-lisp@v4 in another project. I can use the commit hash
for now, so there is no hurry.