fix: Earthly path for vit-testing and vitss artifacts (#578)

# Description
Fixing a path in Earthfile

## Type of change

Please delete options that are not relevant.

- [x] Bug fix (non-breaking change which fixes an issue)


## How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide
instructions so we can reproduce.
Please also list any relevant details for your test configuration

- [ ] Test A
- [ ] Test B

**Test Configuration**: _if applicable_

- Firmware version:
- Hardware:
- Toolchain:
- SDK:

**List of new dependencies**: _if applicable_

Provide a list of newly added dependencies in this PR, with the
description of what are they doing and why do we need them.

- Crate A: description
- Crate B: description

## Checklist

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

src/vit-servicing-station/Earthfile

@@ -5,6 +5,6 @@ build:
     RUN cargo build --locked --release -p vit-servicing-station-cli -p vit-servicing-station-server
 
     # Store the artifacts
-    SAVE ARTIFACT /src/target/release/vit-servicing-station-cli vit-servicing-station-cli
-    SAVE ARTIFACT /src/target/release/vit-servicing-station-server vit-servicing-station-server
+    SAVE ARTIFACT target/release/vit-servicing-station-cli vit-servicing-station-cli
+    SAVE ARTIFACT target/release/vit-servicing-station-server vit-servicing-station-server
     SAVE IMAGE --cache-hint

src/vit-testing/Earthfile

@@ -5,8 +5,8 @@ build:
     RUN cargo build --locked --release -p iapyx -p valgrind -p vitup
 
     # Store the artifact
-    SAVE ARTIFACT /src/target/release/iapyx iapyx
-    SAVE ARTIFACT /src/target/release/iapyx-load iapyx-load
-    SAVE ARTIFACT /src/target/release/valgrind valgrind
-    SAVE ARTIFACT /src/target/release/vitup vitup
+    SAVE ARTIFACT target/release/iapyx iapyx
+    SAVE ARTIFACT target/release/iapyx-load iapyx-load
+    SAVE ARTIFACT target/release/valgrind valgrind
+    SAVE ARTIFACT target/release/vitup vitup
     SAVE IMAGE --cache-hint