Log Message:
pkgtools/pkglint: update to 23.8.0

Changes since 23.7.0:

Prohibit vertical bar in COMMENT, to avoid generating syntactically wrong
INDEX files.

Explain in which cases a `distinfo` file is not needed.

Fix detection of redundant trailing semicolon at the end of a command line.
A semicolon that is escaped is not redundant, this pattern is often found
in `find` commands.

Recognize indirect modifiers such as `${VAR:${M_indirect}}`.