Update Go version to 1.26 in workflows and Dockerfiles

.github/workflows/build.yml

@@ -4,7 +4,7 @@ on:
   workflow_dispatch:
   push:
     branches:
-      - 'master'
+      - 'beta'
     tags:
       - 'v*'
 
@@ -19,7 +19,7 @@ jobs:
 
       - name: Setup Go
         uses: actions/setup-go@v5
-        with: { go-version: '1.25' }
+        with: { go-version: '1.26' }
 
       - name: Build go2rtc_win64
         env: { GOOS: windows, GOARCH: amd64 }

.github/workflows/test.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: '1.24'
+          go-version: '1.26'
 
       - name: Build Go binary
         run: go build -ldflags "-s -w" -trimpath -o ./go2rtc