[CI] Upgrade sccache version to 0.7.* (#16366)

* [CI] Upgrade sccache version to 0.7.*

Sccache was previously pinned at version 0.3.3, however, there has
recently been an issue when installing some of its dependencies:

```
error[E0277]: expected a `Fn(reqwest::Request, &'a mut task_local_extensions::extensions::Extensions, reqwest_middleware::Next<'a>)` closure, found `RetryAfterMiddleware`
```

Upgrading the version of sccache to the latest seems to resolve this
error.

* Use an alternative mirror for boost artifacts

The JFrog artifactory link is down, so changing to an alternative
mirror mentioned in boostorg/boost#842.

docker/install/ubuntu_install_boost.sh

@@ -27,7 +27,7 @@ trap cleanup 0
 # NOTE: by default, tvm-venv python is used. Install boost on the system.
 PATH=${PATH/${TVM_VENV}\/bin:/}
 
-curl -LO https://boostorg.jfrog.io/artifactory/main/release/1.67.0/source/boost_1_67_0.tar.gz
+curl -LO https://archives.boost.io/release/1.67.0/source/boost_1_67_0.tar.gz
 BOOST_HASH=8c247e040303a97895cee9c9407ef205e2c3ab09f0b8320997835ad6221dff23a87231629498ccfd0acca473f74e9ec27b8bd774707b062228df1e5f72d44c92
 echo "$BOOST_HASH" boost_1_67_0.tar.gz | sha512sum -c
 tar -xf boost_1_67_0.tar.gz

docker/install/ubuntu_install_sccache.sh

@@ -20,7 +20,7 @@ set -e
 set -u
 set -o pipefail
 
-cargo install --version 0.3.3 sccache
+cargo install --version 0.7.* sccache
 
 # The docs specifically recommend hard links: https://github.com/mozilla/sccache#known-caveats
 mkdir /opt/sccache