Fix supautils_hook to use the correct role name in ALTER ROLE

[pgnickb]

This Fixes a bug in the supautils_hook that causes a crash. See #108 for more details.

[coveralls]

Pull Request Test Coverage Report for Build 23877545812

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.08%) to 88.737%

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Totals
Change from base Build 23755934970:	0.08%
Covered Lines:	1103
Relevant Lines:	1243

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💛 - Coveralls

[Copilot]

Pull request overview

Fixes a crash in supautils_hook when ALTER ROLE targets current_user / current_role while running as privileged_role, by resolving the role spec to an actual role name before checking privileged-role restrictions.

Changes:

• Use get_rolespec_name(stmt->role) (via role_name) when calling is_role_privileged(...) for ALTER ROLE statements.
• Add a regression test to ensure ALTER ROLE current_user / ALTER ROLE current_role does not crash under privileged_role.
• Add an alternate expected output file (privileged_role_1.out) to accommodate differing server behavior for current_role.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/supautils.c	Prevents NULL role-name dereference by using the resolved RoleSpec name for privileged-role checks.
test/sql/privileged_role.sql	Adds regression coverage for ALTER ROLE current_user/current_role under privileged_role.
test/expected/privileged_role.out	Updates expected output to include the new regression assertions.
test/expected/privileged_role_1.out	Adds alternate expected output variant for environments where current_role yields a syntax error.