drop Node.js 0.6 from CI pipeline.

Test are most likely not broken but running the tests on such and old version is no longer feasible.

.github/workflows/ci.yml

@@ -10,7 +10,6 @@ jobs:
     strategy:
       matrix:
         name:
-        - Node.js 0.6
         - Node.js 0.8
         - Node.js 0.10
         - Node.js 0.12
@@ -38,10 +37,6 @@ jobs:
         - Node.js 22.x
 
         include:
-        - name: Node.js 0.6
-          node-version: "0.6"
-          npm-i: mocha@1.21.5
-          npm-rm: nyc
 
         - name: Node.js 0.8
           node-version: "0.8"
@@ -141,11 +136,6 @@ jobs:
     - name: Install Node.js ${{ matrix.node-version }}
       shell: bash -eo pipefail -l {0}
       run: |
-        if [[ "${{ matrix.node-version }}" == 0.6* ]]; then
-          sudo apt-get install g++-4.8 gcc-4.8 libssl1.0-dev
-          export CC=/usr/bin/gcc-4.8
-          export CXX=/usr/bin/g++-4.8
-        fi
         nvm install --default ${{ matrix.node-version }}
         if [[ "${{ matrix.node-version }}" == 0.* && "$(cut -d. -f2 <<< "${{ matrix.node-version }}")" -lt 10 ]]; then
           nvm install --alias=npm 0.10