That is an old release. GCC 15 support was addressed in commit in main
which was not backported. Since version 23.11 pre-dates the release of that OS
release, it is unreasonable to expect backport.

Use a later DPDK release please.

commit e0d947a1e6c2f80aa039a4f7082a8aa16797d8b9
Author: Ferruh Yigit <ferruh.yigit@amd.com>
Date:   Thu Oct 3 21:13:34 2024 -0700

    ethdev: convert string initialization

    gcc 15 experimental [1], with -Wextra flag, gives warning in variable
    initialization as string [2].

    The warning has a point when initialized variable is intended to use as
    string, since assignment is missing the required null terminator for
    this case. But warning is useless for our usecase.

    In this patch only updated a few instance to show the issue, there are
    many instances to fix, if we prefer to go this way.
    Other option is to disable warning but it can be useful for actual
    string usecases, so I prefer to keep it.

    Converted string initialization to array initialization.

    [1]
    gcc (GCC) 15.0.0 20241003 (experimental)

    [2]
    ../lib/ethdev/rte_flow.h:906:36:
      error: initializer-string for array of ‘unsigned char’ is too long
            [-Werror=unterminated-string-initialization]
    906 |         .hdr.dst_addr.addr_bytes = "\xff\xff\xff\xff\xff\xff",
        |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~

    ../lib/ethdev/rte_flow.h:907:36:
      error: initializer-string for array of ‘unsigned char’ is too long
             [-Werror=unterminated-string-initialization]
    907 |         .hdr.src_addr.addr_bytes = "\xff\xff\xff\xff\xff\xff",
        |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~

    ../lib/ethdev/rte_flow.h:1009:25:
      error: initializer-string for array of ‘unsigned char’ is too long
             [-Werror=unterminated-string-initialization]
    1009 |                         "\xff\xff\xff\xff\xff\xff\xff\xff"
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    ../lib/ethdev/rte_flow.h:1012:25:
      error: initializer-string for array of ‘unsigned char’ is too long
             [-Werror=unterminated-string-initialization]
    1012 |                         "\xff\xff\xff\xff\xff\xff\xff\xff"
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    ../lib/ethdev/rte_flow.h:1135:20:
      error: initializer-string for array of ‘unsigned char’ is too long
             [-Werror=unterminated-string-initialization]
    1135 |         .hdr.vni = "\xff\xff\xff",
         |                    ^~~~~~~~~~~~~~

    Signed-off-by: Ferruh Yigit <ferruh.yigit@amd.com>