Point release tagging at the upstream remote explicitly, not origin

[jnasbyupgrade]

origin in this checkout is the jnasbyupgrade fork, not the canonical Postgres-Extensions/pg_count_nulls repo, so make tag/make dist have always been one git remote -v slip away from tagging the wrong repo. pgxntool 2.2.0 (Postgres-Extensions/pgxntool#53) made the tagging targets' remote configurable via PGXN_REMOTE instead of hardcoding origin, so this sets PGXN_REMOTE = upstream in the Makefile and drops the RELEASE.md step that relied on the release-runner remembering to check origin by hand.

Stacked on #17 (the pgxntool 2.2.0 bump) since PGXN_REMOTE doesn't exist before that version — base.mk previously hardcoded origin with no override.

Verified with make -n tag PGXNVERSION=1.0.0: the push line now reads git push upstream 1.0.0 instead of git push origin 1.0.0.

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