chore: use non-caret dependency versions

Monorepo dependencies were using carets `^`; for most of these it
didn't matter because the resulting artifact was bundled anyway,
but for a couple it did matter:

* `cdk -> aws-cdk`: should use the exact same version, otherwise
  running `npx cdk@2.1000` may accidentally execute `aws-cdk@2.1001`.

Author: rix0rrr

.projenrc.ts

@@ -536,7 +536,7 @@ const cdkAssets = configureProject(
     description: 'CDK Asset Publishing Tool',
     srcdir: 'lib',
     deps: [
-      cloudAssemblySchema,
+      cloudAssemblySchema.customizeReference({ exactVersion: true }),
       cxApi,
       'archiver',
       'glob',
@@ -722,8 +722,8 @@ const cli = configureProject(
       'xml-js',
     ],
     deps: [
-      cloudAssemblySchema,
-      cloudFormationDiff,
+      cloudAssemblySchema.customizeReference({ exactVersion: true }),
+      cloudFormationDiff.customizeReference({ exactVersion: true }),
       cxApi,
       '@aws-cdk/region-info',
       'archiver',
@@ -962,7 +962,7 @@ const cliLib = configureProject(
     entrypoint: 'lib/main.js', // Bundled entrypoint
     description: 'AWS CDK Programmatic CLI library',
     srcdir: 'lib',
-    devDeps: ['aws-cdk-lib', cli, 'constructs'],
+    devDeps: ['aws-cdk-lib', cli.customizeReference({ exactVersion: true }), 'constructs'],
     disableTsconfig: true,
     nextVersionCommand: `tsx ../../../projenrc/next-version.ts copyVersion:../../../${cliPackageJson} append:-alpha.0`,
     releasableCommits: transitiveToolkitPackages('@aws-cdk/cli-lib-alpha'),
@@ -1059,8 +1059,8 @@ const toolkitLib = configureProject(
     description: 'AWS CDK Programmatic Toolkit Library',
     srcdir: 'lib',
     deps: [
-      cloudAssemblySchema,
-      cloudFormationDiff,
+      cloudAssemblySchema.customizeReference({ exactVersion: true }),
+      cloudFormationDiff.customizeReference({ exactVersion: true }),
       cxApi,
       '@aws-cdk/region-info',
       `@aws-sdk/client-appsync@${CLI_SDK_V3_RANGE}`,
@@ -1305,7 +1305,7 @@ const cdkAliasPackage = configureProject(
     name: 'cdk',
     description: 'AWS CDK Toolkit',
     srcdir: 'lib',
-    deps: [cli],
+    deps: [cli.customizeReference({ exactVersion: true })],
     nextVersionCommand: `tsx ../../projenrc/next-version.ts copyVersion:../../${cliPackageJson}`,
     releasableCommits: transitiveToolkitPackages('cdk'),
   }),