Bump dynstrv0.1.0-rc2

dynstr got its v0.1.0-rc1 release, and this commit introduces a fix:

commit 0e779caae658f118d535e9f0a74f0012eefca9a0
Author: Xavier Del Campo Romero <xavi.dcr@tutanota.com>
Date:   Mon Oct 2 14:38:53 2023 +0200

    CMakeLists.txt: add cmake_minimum_required

    This command is mandatory for all CMake projects. 3.0 was chosen since
    dynstr does not require any newer CMake features.

1 files changed, 0 insertions, 0 deletions

diff --git a/dynstr b/dynstr
-Subproject 58bd7d93762e7a5eeba17e0cdb527b7f600ddc6
+Subproject d0d843b7046ced76336604450f8eb78b4decfa0