Upgrade to Rocket v0.5.2 (#7890)

Upgrade Rocket to v0.5.2 which has updated all the crate dependencies.
Also adjusted some code which I changed with Rkt and during that found
some small bugs and fixed those too.

Adjusted the ETag Caching a bit.

Also updated other crates and GHA.

Signed-off-by: BlackDex <black.dex@gmail.com>

.github/workflows/zizmor.yml

@@ -24,7 +24,7 @@ jobs:
           persist-credentials: false
 
       - name: Run zizmor
-        uses: zizmorcore/zizmor-action@85b2b9fb8e3325e7a23d7d0a9d7ba5ae0f999e3e # v0.7.1
+        uses: zizmorcore/zizmor-action@53290badfa369cb0bf7ad16342cb62c2fa47ac7b # v0.8.0
         with:
           # intentionally not scanning the entire repository,
           # since it contains integration tests.