Switch to vcpkg for dependencies.

Ubuntu ships very old versions and it's cramping my style.
(In particular, I want to be able to use Abseil logging.)

While I'm here, add GCC 14 to the build matrix.

... and remove GCC 11 so that we continue to
test with only the three most recent releases.

Change-Id: If7eb226005d8d9e56d3523e6e255d29814646d10
Reviewed-on: https://code-review.googlesource.com/c/re2/+/63070
Reviewed-by: Alex Chernyakhovsky <achernya@google.com>
Reviewed-by: Paul Wankadia <junyer@google.com>

.github/workflows/ci-cmake.yml

diff --git a/.github/workflows/ci-cmake.yml b/.github/workflows/ci-cmake.yml
index 07ecdfb..c4f21ac 100644
--- a/.github/workflows/ci-cmake.yml
+++ b/.github/workflows/ci-cmake.yml
@@ -7,26 +7,20 @@
 jobs:
   build-linux:
     runs-on: ubuntu-latest
-    # The Benchmark package on Ubuntu 22.04 LTS is problematic whereas this
-    # Docker container is based on Debian bookworm and has a newer version.
-    container: gcc:13
     strategy:
       fail-fast: false
       matrix:
         build_shared_libs: [OFF, ON]
     steps:
       - uses: actions/checkout@v4.1.4
-      - name: Install CMake
-        run: |
-          apt update -y
-          apt install -y cmake
-        shell: bash
       - name: Install Abseil, GoogleTest and Benchmark
         run: |
-          apt update -y
-          apt install -y libabsl-dev libgtest-dev libbenchmark-dev
+          vcpkg update
+          vcpkg install abseil gtest benchmark
         shell: bash
-      - run: .github/cmake.sh -D BUILD_SHARED_LIBS=${{ matrix.build_shared_libs }}
+      - run: |
+          .github/cmake.sh -D BUILD_SHARED_LIBS=${{ matrix.build_shared_libs }} \
+            -D CMAKE_TOOLCHAIN_FILE=/usr/local/share/vcpkg/scripts/buildsystems/vcpkg.cmake
         shell: bash
   build-macos:
     runs-on: macos-latest

.github/workflows/ci.yml

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b83b4e5..b367ca2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,6 +38,7 @@
     env:
       CC: clang-${{ matrix.ver }}
       CXX: clang++-${{ matrix.ver }}
+      PKG_CONFIG_PATH: /usr/local/share/vcpkg/installed/x64-linux/lib/pkgconfig
     steps:
       - uses: actions/checkout@v4.1.4
       - name: Install Clang ${{ matrix.ver }}
@@ -50,26 +51,28 @@
         shell: bash
       - name: Install Abseil, GoogleTest and Benchmark
         run: |
-          sudo apt update -y
-          sudo apt install -y libabsl-dev libgtest-dev libbenchmark-dev
+          vcpkg update
+          vcpkg install abseil gtest benchmark
         shell: bash
       - run: make && make test
         shell: bash
   build-gcc:
-    runs-on: ubuntu-latest
+    # TODO(junyer): Switch back to `ubuntu-latest` when this becomes that.
+    runs-on: ubuntu-24.04
     strategy:
       fail-fast: false
       matrix:
-        ver: [11, 12, 13]
+        ver: [12, 13, 14]
     env:
       CC: gcc-${{ matrix.ver }}
       CXX: g++-${{ matrix.ver }}
+      PKG_CONFIG_PATH: /usr/local/share/vcpkg/installed/x64-linux/lib/pkgconfig
     steps:
       - uses: actions/checkout@v4.1.4
       - name: Install Abseil, GoogleTest and Benchmark
         run: |
-          sudo apt update -y
-          sudo apt install -y libabsl-dev libgtest-dev libbenchmark-dev
+          vcpkg update
+          vcpkg install abseil gtest benchmark
         shell: bash
       - run: make && make test
         shell: bash