Increase the MSRV and bump dependencies (#1137)

* Bump the MSRV to 1.58

Bumps the official MSRV to 1.58.
This is likely more than required the upcoming version bumps.

* Upgrade cargo zstd to 0.10

* Bump serial_test to v0.6

Changelog does not mention any breaking changes.

* Bump blake to v1

* Bump rouille to 3.5

Required to bump syslog to v6, since otherwise no common version
can be selected for `time`

* Bump syslog to v6

No changelog available. Depends on rouille bump to 3.5, to get a
common version of ´time´.

* Upgrade JWT to v8

The explicit insecure decode method was removed and replaced by
an option for the Validation struct.
The `exp` field had to be added to JobJwt, since otherwise the validation would fail at runtime.
Apparently the `exp` field is required now, even if the valdiation of `exp` is turned off.

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
         uses: ./.github/actions/rust-toolchain
         with:
           components: ${{ matrix.component }}
-          toolchain: 1.58.1
+          toolchain: 1.58
 
       - name: clippy version
         run: cargo clippy --version
@@ -42,24 +42,24 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-18.04
-            rustc: 1.48.0 # Oldest supported version, keep in sync with README.md
-          - os: ubuntu-18.04
-            rustc: 1.48.0
+          - os: ubuntu-20.04
+            rustc: 1.58.0 # Oldest supported version, keep in sync with README.md
+          - os: ubuntu-20.04
+            rustc: 1.58.0
             extra_desc: dist-server
             extra_args: --no-default-features --features=dist-tests test_dist_ -- --test-threads 1
-          - os: ubuntu-18.04
+          - os: ubuntu-20.04
             rustc: stable
-          - os: ubuntu-18.04
+          - os: ubuntu-20.04
             rustc: beta
-          - os: ubuntu-18.04
+          - os: ubuntu-20.04
             rustc: nightly
             allow_failure: true
             extra_args: --features=unstable
           - os: ubuntu-22.04
           - os: macOS-10.15
           - os: windows-2019
-            rustc: 1.48.0 # Oldest supported version, keep in sync with README.md
+            rustc: 1.58.0 # Oldest supported version, keep in sync with README.md
           - os: windows-2019
             rustc: nightly
             allow_failure: true
@@ -172,7 +172,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-18.04
+          - os: ubuntu-20.04
             rustc: nightly
             allow_failure: true
             extra_args: --features=unstable