change internship columns to text

src/main/resources/db/migration/V1_91__increase_column_content_length.sql

+ALTER TABLE internship
+ALTER COLUMN description TYPE TEXT;
+
+ALTER TABLE internship_week
+ALTER COLUMN description TYPE TEXT;
+
+ALTER TABLE internship_week
+ALTER COLUMN company_comment TYPE TEXT;
+
+ALTER TABLE internship_week
+ALTER COLUMN coordinator_comment TYPE TEXT;
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