fix: write artifact basename to configuration in update dependencies (#347)

Issue #, if available:
Found in #346 

*Description of changes:*
This change updates update-rootfs.sh and update-deps.sh to write the
artifact basename to the ARTIFACT configuration variable.

*Testing done:*
Locally tested in bash:
```
aarch64_deps="aarch64/lima-and-qemu.macos-aarch64.1719307443.tar.gz"
echo "AARCH64_ARTIFACT=$(basename "${aarch64_deps}")"
```

- [x] I've reviewed the guidance in CONTRIBUTING.md

#### License Acceptance

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Signed-off-by: Austin Vazquez <[email protected]>

Author: austinvazquez

bin/update-deps.sh

@@ -50,10 +50,10 @@ truncate -s 0 "${BUNDLES_FILE}"
     echo "ARTIFACT_BASE_URL=${DEPENDENCY_CLOUDFRONT_URL}"
     echo ""
     echo "AARCH64_ARTIFACT_PATHING=${AARCH64}"
-    echo "AARCH64_ARTIFACT=${aarch64_deps}"
+    echo "AARCH64_ARTIFACT=$(basename "${aarch64_deps}")"
     echo "AARCH64_512_DIGEST=${aarch64_deps_shasum}"
     echo ""
     echo "X86_64_ARTIFACT_PATHING=${X86_64}"
-    echo "X86_64_ARTIFACT=${amd64_deps}"
+    echo "X86_64_ARTIFACT=$(basename "${amd64_deps}")"
     echo "X86_64_512_DIGEST=${amd64_deps_shasum}"
 } >> "${BUNDLES_FILE}"

bin/update-rootfs.sh

@@ -45,6 +45,6 @@ truncate -s 0 "${ROOTFS_FILE}"
     echo "ARTIFACT_BASE_URL=${DEPENDENCY_CLOUDFRONT_URL}"
     echo ""
     echo "X86_64_ARTIFACT_PATHING=${PLATFORM}/${X86_64}"
-    echo "X86_64_ARTIFACT=${amd64_deps}"
+    echo "X86_64_ARTIFACT=$(basename "${amd64_deps}")"
     echo "X86_64_512_DIGEST=${amd64_deps_shasum}"
 } >> "${ROOTFS_FILE}"