chore: update Rust version to 1.78.0 in workflow configurations

.github/workflows/deploy.yml

@@ -8,7 +8,7 @@ jobs:
     name: Build Linux
     timeout-minutes: 30
     runs-on: ubuntu-latest
-    container: rust:1.74.0
+    container: rust:1.78.0
     steps:
       - name: Checkout code from repository
         uses: actions/checkout@v4
@@ -51,8 +51,8 @@ jobs:
         uses: actions/checkout@v4
       - name: Setup Rust
         run: |
-          rustup install 1.74.0
-          rustup override set 1.74.0
+          rustup install 1.78.0
+          rustup override set 1.78.0
           rustup default stable-msvc
       - name: Build Base
         run: cargo build --release
@@ -87,8 +87,8 @@ jobs:
         uses: actions/checkout@v4
       - name: Setup Rust
         run: |
-          rustup install 1.74.0
-          rustup override set 1.74.0
+          rustup install 1.78.0
+          rustup override set 1.78.0
       - name: Build Base
         run: cargo build --release
       - name: Build SDL

.github/workflows/extra.yml

@@ -13,8 +13,8 @@ jobs:
         uses: actions/checkout@v4
       - name: Setup Rust
         run: |
-          rustup install 1.74.0
-          rustup override set 1.74.0
+          rustup install 1.78.0
+          rustup override set 1.78.0
           rustup default stable-msvc
       - name: Setup SDL
         run: |
@@ -47,8 +47,8 @@ jobs:
         uses: actions/checkout@v4
       - name: Setup Rust
         run: |
-          rustup install 1.74.0
-          rustup override set 1.74.0
+          rustup install 1.78.0
+          rustup override set 1.78.0
       - name: Setup SDL
         run: |
           cd frontends/sdl

.github/workflows/main.yml

@@ -126,10 +126,6 @@ jobs:
     strategy:
       matrix:
         rust-version: [
-          "1.74.0",
-          "1.75.0",
-          "1.76.0",
-          "1.77.0",
           "1.78.0",
           "1.79.0",
           "1.80.0",