Bump actions/cache from 3 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -34,19 +34,19 @@ jobs:
         components: rustfmt, clippy
 
     - name: Cache cargo registry
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.cargo/registry
         key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
 
     - name: Cache cargo index
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.cargo/git
         key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
 
     - name: Cache cargo build
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: target
         key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
@@ -79,7 +79,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Cache pip packages
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('**/pyproject.toml') }}
@@ -297,7 +297,7 @@ jobs:
         override: true
 
     - name: Cache cargo
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: |
           ~/.cargo/registry

.github/workflows/neural-nexus-ci-cd.yml

@@ -34,19 +34,19 @@ jobs:
         components: rustfmt, clippy
 
     - name: Cache cargo registry
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.cargo/registry
         key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
 
     - name: Cache cargo index
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.cargo/git
         key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
 
     - name: Cache cargo build
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: target
         key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
@@ -79,7 +79,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Cache pip packages
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip-${{ hashFiles('**/pyproject.toml') }}
@@ -297,7 +297,7 @@ jobs:
         override: true
 
     - name: Cache cargo
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: |
           ~/.cargo/registry

.github/workflows/neural-nexus-ci.yml

@@ -22,7 +22,7 @@ jobs:
         components: rustfmt, clippy
 
     - name: Cache dependencies
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: |
           ~/.cargo/registry