Bump swift-actions/setup-swift from 2 to 3

Bumps [swift-actions/setup-swift](https://github.com/swift-actions/setup-swift) from 2 to 3.
- [Release notes](https://github.com/swift-actions/setup-swift/releases)
- [Commits](swift-actions/setup-swift@v2...v3)

---
updated-dependencies:
- dependency-name: swift-actions/setup-swift
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/gma_mediation_applovin.yaml

@@ -53,7 +53,7 @@ jobs:
     runs-on: macos-latest
     timeout-minutes: 40
     steps:
-      - uses: swift-actions/setup-swift@v2
+      - uses: swift-actions/setup-swift@v3
         with:
           swift-version: "5.7.2"
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683

.github/workflows/gma_mediation_dtexchange.yaml

@@ -53,7 +53,7 @@ jobs:
     runs-on: macos-latest
     timeout-minutes: 40
     steps:
-      - uses: swift-actions/setup-swift@v2
+      - uses: swift-actions/setup-swift@v3
         with:
           swift-version: "6.0.0"
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683

.github/workflows/gma_mediation_ironsource.yaml

@@ -52,7 +52,7 @@ jobs:
     runs-on: macos-latest
     timeout-minutes: 40
     steps:
-      - uses: swift-actions/setup-swift@v2
+      - uses: swift-actions/setup-swift@v3
         with:
           swift-version: "6.0.0"
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683

.github/workflows/gma_mediation_liftoffmonetize.yaml

@@ -53,7 +53,7 @@ jobs:
     runs-on: macos-latest
     timeout-minutes: 40
     steps:
-      - uses: swift-actions/setup-swift@v2
+      - uses: swift-actions/setup-swift@v3
         with:
           swift-version: "5.7.2"
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683

.github/workflows/gma_mediation_unity.yaml

@@ -53,7 +53,7 @@ jobs:
     runs-on: macos-latest
     timeout-minutes: 40
     steps:
-      - uses: swift-actions/setup-swift@v2
+      - uses: swift-actions/setup-swift@v3
         with:
           swift-version: "6.0.0"
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683