gnu: Rename valgrind-next to valgrind.

* gnu/packages/valgrind.scm (valgrind/pinned): Make public.
(valgrind): Delete.
(valgrind-next): Rename to valgrind.
(valgrind/interactive): Inherit from valgrind.
* gnu/packages/audio.scm (codec2),
* gnu/packages/bootloaders.scm (dtc),
* gnu/packages/chromium.scm (ungoogled-chromium),
* gnu/packages/crates-io.scm (rust-crabgrind-0.1),
* gnu/packages/crates-tls.scm (rust-rustls-pki-types-1),
* gnu/packages/file-systems.scm (bindfs),
* gnu/packages/gnome.scm (libratbag, gnome-software),
* gnu/packages/high-availability.scm (pacemaker),
* gnu/packages/linux.scm (multipath-tools),
* gnu/packages/machine-learning.scm (python-pytorch),
* gnu/packages/mpi.scm (openmpi-4),
* gnu/packages/music.scm (stargate),
* gnu/packages/perl-check.scm (perl-test-runvalgrind),
* gnu/packages/prolog.scm (trealla),
* gnu/packages/qt.scm (qtwebengine-5, qt-creator),
* gnu/packages/robotics.scm (aseba),
* gnu/packages/ruby.scm (ruby-ruby-memcheck),
* gnu/packages/spreadsheet.scm (sc-im),
* gnu/packages/web.scm (jq): Rename valgrind to valgrind/pinned.

Change-Id: I9dec25abce643ef6d815a2cc50414c4f65f1e8d3

gnu/packages/chromium.scm

@@ -924,7 +924,7 @@
            snappy
            speech-dispatcher
            eudev
-           valgrind
+           valgrind/pinned
            vulkan-headers
            vulkan-loader
            wayland