Pin cat_tools to the 0.3.0 tag now that it exists

[jnasbyupgrade]

Summary

Small follow-up to #10. cat_tools 0.3.0 has just been tagged on GitHub
(Postgres-Extensions/cat_tools) — before this, fix-cat-tools-install's
CAT_TOOLS_GIT_REF had already moved past its original raw-SHA pin to
tracking master directly (see baf0a6e), since 0.3.0 hadn't been tagged
yet and there was nothing more stable to point at.

Now that a real tag exists, this re-points CAT_TOOLS_GIT_REF at 0.3.0
instead of the moving master branch. Checked first: the 0.3.0 tag's
commit (5fa8083d...) is identical to cat_tools' current master tip, so
this is a pure reference-stability change — same commit, just a fixed,
intentional name instead of a moving branch pointer — not a behavior
change. No regression check across a range was needed since there's no
delta between the two refs.

This does NOT unblock cutting a real extension_drop PGXN release.
cat_tools 0.3.0 is tagged on GitHub but still not published to PGXN
Manager, and RELEASE.md's rule is that a dependency pinned to a git
source (rather than genuinely pgxn install-able) blocks a release. The
original fix's exit condition — revert to a plain
pgxn install 'cat_tools>=0.3.0' --sudo once it's actually on PGXN — still
stands and hasn't been reached.

What changed

• Makefile: CAT_TOOLS_GIT_REF changed from master to 0.3.0, comment
  updated to describe the tag now existing and reiterate the
  does-not-unblock-release caveat.

Test plan

• Ran make cat_tools from a clean state (removed the installed
  cat_tools.control/sql files first) — clone + git checkout 0.3.0 +
  install succeeded.
• Confirmed default_version in the installed cat_tools.control
  resolves to 0.3.0, same as before.
• make install and make test: schema and simple pass. zzz_build
  fails, but that's pre-existing and unrelated — test/expected/zzz_build.out
  hasn't changed since the initial commit, and the diff is PG17 emitting
  new %TYPE-reference NOTICE messages in extension_drop.sql itself,
  nothing to do with cat_tools or this change.

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