[New msys2-runtime-package version] msys2-runtime: bump to v3.5.5

[github-actions]

msys2-runtime: bump to v3.5.5

This corresponds to /~https://github.com/msys2/msys2-runtime/pull/249.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

msys2/MSYS2-packages@01bdc2a

[dscho]

Things are not well in Cygwin land; There are reports of random hangs: msys2/msys2-runtime#251 (comment),

I am going to merge git-for-windows/msys2-runtime#80, but if we cannot figure out those test suite hangs before Git for Windows v2.48.0-rc1 (due tomorrow, or at least the day after; Yes, it's unfortunate timing with regards to most core Git developers' holidays), I want to roll back Git for Windows' SDK to v3.5.4.

[dscho]

Despite the quick brown-bag-paper fix backported via git-for-windows/msys2-runtime#80, there are still some inexplicable hangs in MSYS2 runtime v3.5.5. And since Git v2.48.0-rc1 already landed, I'll roll back Git for Windows' SDK to MSYS2 runtime v3.5.4 and Git for Windows v2.48.0 will not have MSYS2 runtime v3.5.5.