ci: remove an unneeded cmake install step

The `static_build_cmake_linux` workflow installs CMake 3.17, because it
needs ctest's `--repeat until-pass:3` option. However, now a previous
step ensures that CMake 3.26 is installed (related commands were added
into `install-deps-debian`).

The original motivation behind the removed step was to upgrade CMake,
but now the step downgrades it, which makes little sense.

For those who worry whether we verify the build with an older CMake
version: we have CMake 3.18 in the CentOS 7 job of the `distrib`
workflow, and 3.18 will be the new minimum supported version soon (see
the linked issue).

Part of tarantool#13306

NO_DOC=ci
NO_CHANGELOG=ci
NO_TEST=ci

Author: Totktonada

.github/workflows/static_build_cmake_linux.yml

@@ -89,13 +89,6 @@ jobs:
         with:
           submodule: ${{ inputs.submodule }}
           revision: ${{ inputs.revision }}
-      # Install CMake using PyPI, because option
-      # `--repeat until-pass:3` required by CTest was added since
-      # CMake 3.17.
-      - name: install cmake
-        run: |
-          apt -y remove cmake
-          pip3 install cmake==3.17.3
       - name: test
         run: make -f .test.mk test-static-cmake
       - name: Send VK Teams message on failure