Revert "[chore] require Go 1.22 (open-telemetry#2747)" (open-telemetry#2753)

This reverts commit 2409359.

Author: swiatekm

.github/workflows/continuous-integration.yaml

@@ -21,7 +21,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v5
       with:
-        go-version: "~1.22.1"
+        go-version: "~1.21.1"
 
     - name: Cache tools
       uses: actions/cache@v4
@@ -45,7 +45,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v5
       with:
-        go-version: "~1.22.1"
+        go-version: "~1.21.1"
 
     - name: Cache tools
       uses: actions/cache@v4
@@ -79,7 +79,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v5
       with:
-        go-version: "~1.22.1"
+        go-version: "~1.21.1"
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v3

.github/workflows/e2e.yaml

@@ -45,7 +45,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v5
       with:
-        go-version: "~1.22.0"
+        go-version: "~1.21.3"
     - name: Cache tools
       uses: actions/cache@v4
       with:

.github/workflows/publish-images.yaml

@@ -19,7 +19,7 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version: '~1.22.1'
+          go-version: '~1.21.3'
 
       - name: Unshallow 
         run: git fetch --prune --unshallow

.github/workflows/publish-operator-opamp-bridge.yaml

@@ -23,7 +23,7 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version: '~1.22.1'
+          go-version: '~1.21.3'
 
       # TODO: We're currently not using this. Should we?
       - name: Read version

.github/workflows/publish-target-allocator.yaml

@@ -23,7 +23,7 @@ jobs:
 
       - uses: actions/setup-go@v5
         with:
-          go-version: '~1.22.1'
+          go-version: '~1.21.3'
 
       # TODO: We're currently not using this. Should we?
       - name: Read version

.github/workflows/release.yaml

@@ -36,7 +36,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v5
       with:
-        go-version: "~1.22.1"
+        go-version: "~1.21.1"
 
     - name: "generate release resources"
       run: make release-artifacts IMG_PREFIX="ghcr.io/open-telemetry/opentelemetry-operator" VERSION=${DESIRED_VERSION}

.github/workflows/scorecard.yaml

@@ -25,7 +25,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: "~1.22.1"
+          go-version: "~1.21.1"
 
       - name: Check out code into the Go module directory
         uses: actions/checkout@v4

go.mod

@@ -1,6 +1,6 @@
 module github.com/open-telemetry/opentelemetry-operator
 
-go 1.22
+go 1.21
 
 retract v1.51.0