Fix CI errors due to ubuntu 24.04 image rollout (#1290)

### Changelog
None

### Docs

None

### Description

CI [broke
recently](https://github.com/foxglove/mcap/actions/runs/12302494967)
because (I think) `ubuntu-latest` changed to `ubuntu-24.04`. The 24.04
image no longer has python 3.7/3.8
(actions/runner-images#10636). It also causes
an error with the `setup-swift` action
(swift-actions/setup-swift#677).

~Our `setup.cfg` declares `python_requires = >=3.7`, however we were
using 3.8 in most CI jobs (#988). I
downgraded these from 3.8 to 3.7 here.~ It was hard to get this working
so I left it at 3.8.

- Included a drive-by lint fix

.github/workflows/ci.yml

@@ -78,7 +78,7 @@ jobs:
       - run: yarn test:conformance --runner go-
 
   conformance-python:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04 # required for python 3.8
     steps:
       - uses: actions/checkout@v4
         with:
@@ -90,7 +90,7 @@ jobs:
           cache: yarn
       - uses: actions/setup-python@v5
         with:
-          python-version: 3.7
+          python-version: 3.8
       - run: cd python && pip install -e mcap
       - run: yarn install --immutable
       - run: yarn test:conformance:generate-inputs --verify
@@ -127,7 +127,7 @@ jobs:
       - run: yarn test:conformance --runner ksy-
 
   conformance-swift:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04 # https://github.com/swift-actions/setup-swift/issues/677
     steps:
       - uses: actions/checkout@v4
         with:
@@ -200,7 +200,7 @@ jobs:
           key: ${{ runner.os }}-${{ hashFiles('cpp/**/conanfile.py') }}
       - uses: actions/setup-python@v5
         with:
-          python-version: 3.7
+          python-version: 3.8
       - run: pip install conan~=1.0
       - run: bash build.sh --build-tests-only
       - run: ./test/build/Debug/bin/unit-tests
@@ -293,7 +293,7 @@ jobs:
       - run: yarn workspace @foxglove/mcap-example-text-annotation-demo typecheck
 
   python:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04 # required for python 3.8
     defaults:
       run:
         working-directory: python
@@ -464,7 +464,7 @@ jobs:
           draft: false
 
   swift:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04 # https://github.com/swift-actions/setup-swift/issues/677
     steps:
       - uses: actions/checkout@v4
         with:

.github/workflows/website.yml

@@ -50,7 +50,7 @@ jobs:
           retention-days: 1
 
   docs-python:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04 # required for python 3.8
     steps:
       - uses: actions/checkout@v4
 
@@ -71,7 +71,7 @@ jobs:
           retention-days: 1
 
   docs-swift:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04 # https://github.com/swift-actions/setup-swift/issues/677
     steps:
       - uses: actions/checkout@v4
 

website/src/components/McapRecordingDemo/McapRecordingDemo.tsx

@@ -273,6 +273,7 @@ export function McapRecordingDemo(): JSX.Element {
     enableCamera,
     recordH264,
     recordH265,
+    recordVP9,
     recordAV1,
     recording,
     videoStarted,