CI: seperate apt update and install

To counter

```
E: Failed to fetch https://packages.microsoft.com/ubuntu/22.04/prod/dists/jammy/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)

```

the CI is changed to try to update and ignore issues and afterwards
install instead of chaining it with `&&` to only install when update
succeeds.

.github/workflows/linting.yml

@@ -19,7 +19,8 @@ jobs:
         working-directory: rust
     steps:
       - uses: actions/checkout@v4
-      - run: sudo apt update && sudo apt-get install -y libpcap-dev
+      - run: sudo apt update || true
+      - run: sudo apt-get install -y libpcap-dev
       - run: rustup update stable && rustup default stable || rustup default stable 
       - run: cargo install cargo-audit
       - run: cargo install typos-cli

.github/workflows/tests.yml

@@ -22,7 +22,8 @@ jobs:
         working-directory: rust
     steps:
       - uses: actions/checkout@v4
-      - run: sudo apt update && sudo apt-get install -y libpcap-dev
+      - run: sudo apt update || true
+      - run: sudo apt-get install -y libpcap-dev
       - run: rustup update stable && rustup default stable || rustup default stable 
       - name: unit-tests
         run: cargo test --lib --tests --workspace