chore(lint): release the #2127 import-filter strings through safe_free

The memory-core ratchet flagged src/pipeline/pass_pkgmap.c growing by 2 raw
allocator sites (82 -> 84). Both are frees of strings returned by
cbm_pipeline_fqn_compute and cbm_pipeline_resolve_module, which the core
never counted, so they now go through safe_free as the rest of the codebase
does rather than raw free or cbm_free. Behaviour is unchanged;
pass_pkgmap.c is back at its baseline of 82.

Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>

Author: DeusData

src/pipeline/pass_pkgmap.c

@@ -1630,7 +1630,7 @@ static bool python_import_local_materialized(const cbm_gbuf_t *gbuf, const char
     }
     char *file_qn = cbm_pipeline_fqn_compute(project_name, rel_path, "__file__");
     const cbm_gbuf_node_t *file_node = file_qn ? cbm_gbuf_find_by_qn(gbuf, file_qn) : NULL;
-    free(file_qn);
+    safe_free(file_qn);
     const cbm_gbuf_edge_t **edges = NULL;
     int edge_count = 0;
     if (!file_node || cbm_gbuf_find_edges_by_source_type(gbuf, file_node->id, "IMPORTS", &edges,
@@ -1713,7 +1713,7 @@ static bool python_import_module_in_project(const cbm_pipeline_ctx_t *ctx, const
     *dot = '\0';
     char *qn = cbm_pipeline_resolve_module(ctx, source_rel, part);
     bool found = qn && cbm_gbuf_find_by_qn(ctx->gbuf, qn) != NULL;
-    free(qn);
+    safe_free(qn);
     return found;
 }