.github: simplify, skip apt update

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

Author: troglobit

.github/workflows/build.yml

@@ -26,7 +26,6 @@ jobs:
     steps:
       - name: Install dependencies
         run: |
-          sudo apt-get -y update
           sudo apt-get -y install tree tshark valgrind libssl-dev
       - uses: actions/checkout@v6
       - name: Configure

.github/workflows/release.yml

@@ -14,7 +14,6 @@ jobs:
       - uses: actions/checkout@v6
       - name: Installing dependencies ...
         run: |
-          sudo apt-get -y update
           sudo apt-get -y install tree tshark valgrind
       - name: Creating Makefiles ...
         run: |